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Auxiliary floating drydock

An auxiliary floating drydock is a type of US Navy floating dry dock. Floating dry docks are able to submerge underwater and to be placed under a ship in need of repair below the water line. Water is then pumped out of the floating dry dock, raising the ship out of the water. The ship becomes blocked on the deck of the floating dry dock for repair. Most floating dry docks have no engine and are towed by tugboats to their destinations. Floating dry docks come in different sizes to accommodate varying ship sizes, while large floating dry docks come in sections and can be combined to increase their size and lift power. Ballast pontoon tanks are flooded with water to submerge or pumped dry to raise the ship.[1][2]

Los Alamos (AFDB-7), with a repaired submarine at Holy Loch, Scotland in 1985
YFD-2 The first Yard Floating Dock built in 1901, arriving Pearl Harbor 23 Oct. 1940 from New Orleans Naval Yard
USS Pennsylvania in drydock USS Dewey, the second YFD, c. 1906–1907

World War II

At the start of World War II, the US Navy had only three steel auxiliary floating dry docks:

  1. Auxiliary floating drydock YFD-2, built in 1901, was at Pearl Harbor. YFD-2 was repairing the US destroyer USS Shaw on 7 December 1941 during the attack on the harbor. Both YFD-2 and USS Shaw were repaired, after being hit and damaged in the attack.[3]
  2. The auxiliary floating drydock USS Dewey, built in 1905, was scuttled at Mariveles to prevent its capture by the Japanese. In 1942 Japan raised the Dewey, but it was resunk by US forces.
  3. Auxiliary floating dry dock USS ARD-1, built in 1933, was also at Pearl Harbor. USS ARD-1 was a self-sustaining mobile dry dock.

To reduce travel time for repair work, over 150 auxiliary floating dry docks of different sizes were built during World War II between 1942 and 1945. These newly built floating dry docks had a lift capacity of 400 to 100,000 tons. Without these forward repair bases, ships would have had to return to the US for repairs. Between 1 October 1944 and 17 October 1945, 7,000 ships were repaired in auxiliary floating dry docks. After World War II some auxiliary floating dry docks were sold for private use and others were scrapped. In addition to auxiliary floating dry docks, timber floating dry docks were built for use in World War II. Timber floating dry docks had a lift capacity of 400 to 20,000 tons. They were not towed across the open ocean and were not given a US Navy class.[4][2]

Role

During wartime, ships in continuous use need repair both from wear and from war damage such as from naval mines, kamikaze attacks, dive bombs and torpedoes. Rudders and propellers are best serviced on dry docks. Without remote on-location dry docks, months could be lost if a ship returned to a home port for repair. Most auxiliary floating drydocks had provisions for the repair crew, including bunk beds, meals, and laundry. Most had power stations, ballast pumps, repair shops, machine shops, and mess halls to be self-sustaining. Some auxiliary floating drydocks also had provisions for the ship under repair, but when possible, the crew of the damaged ship remained on ship while repairs were done. Many had cranes able to lift tons of material and parts to remove damaged parts and to install new parts.[5][2]

Armament

Most auxiliary floating drydocks had only anti-aircraft guns for defense, as space would not allow for large guns. Typical armaments included 40 mm and 20 mm machine guns. Japanese pilots sometimes mistook empty auxiliary floating drydocks for aircraft carriers.[6][2]

Large Auxiliary Floating Dry Docks (AFDB)

 
USS AFDB-3 with rail traveling 15-ton crane

Auxiliary Floating Docks, Big (AFDB), also known as Advance Base Sectional Docks (ABSD), came in sections, 93 ft long and 3,850 tons each. Each section had a 165-ft beam, a 75-ft molded depth, and 10,000 tons of lifting capacity. Sections could be put together to lift larger ships. AFDB were needed to repair battleships, aircraft carriers, cruisers, and large auxiliary ships. The AFDB-1 Artisan had 10 sections (A to J) for a total lift of 100,000 tons, and was 1,000 ft long with all 10 sections installed. AFDB-1 to 7 were built between 1943 and 1945 and towed to remote navy bases. An AFDB would have a crew of 600 to 1,000 men, a fresh-water distilling plant and was otherwise self-sustaining. They had a rail traveling 15-ton capacity crane with an 85-foot radius and two or more support barges. To pump water from the tanks, there were two 24-in discharge pumps on each section, each pump rated 15,000 gpm. For electricity, there were two 350-kw diesel AC generators on each section, producing 440 volts 3-phase 60-cycle power. AFDBs had steam plants to run the pumps. Each section could store 65,000 gallons of fuel oil to supply the ships under repair. Crew lived in barracks ships, called APL, that docked next to the AFDB.[4][7][2][8]

Post WW2

Medium Auxiliary Floating Dry Docks (AFDM)

 
YFD-6 center section floated through the Panama Canal on its side. Towed by USS Alarka (YTB-229) (center) and USS Umpqua (ATA-209)(left) in 1945. Navy SeaBees turned it on its side with many pontoons to fit through the canal

AFDM are from 6,800 to 8,000 tons and are from 528 to 622 feet long. An AFDM has a crew of 140 to 200 men. An AFDM had a lift capacity 18,000 tons and was armed with two 40 mm and four 20 mm guns. It also had two 7+12-ton cranes with 16 ballast tank compartments. AFDMs were built in three pieces, a long center section and two shorter sections, one at each end.[4][17][2][18] All AFDM also had Yard Floating Docks (YFD) class numbers.

Medium Auxiliary Repair Docks (ARDM)

Auxiliary repair dock Mobile (ARDM) are 5,200 tons and 489 feet long. ARDs had a ship form hull and lifting capacity of 3,500 tons. ARDMs were used to repair destroyers, submarines, and small auxiliaries. ARDMs had a crew of 130 to 160 men.[4][2]

Post WW2

Small Auxiliary Floating Dry Docks (AFD - AFDL)

 
USS Dynamic (AFD-6)-AFDL-6 at Virginia Beach, Va. on Nov. 2, 2006

Auxiliary Floating Docks, Light (AFDL), also known as Auxiliary Floating Docks (AFD), were 288 ft long, had a beam of 64 ft (20 m), and draft of 3 ft 3 in (0.99 m) empty and 31 ft 4 in (9.55 m) flooded to load a ship. A normal crew was 60 men. AFDL displacement was 1,200 tons and could lift 1,900 tons. AFDL were built as one piece, open at both ends. AFDL were used to repair small craft, PT boats and small submarines. All AFD were reclassified AFDL after the war in 1946.[4][29][30]

  • USS Endeavor AFD-1 – AFDL-1 By Chicago Bridge
  • USS AFD-2 – By Chicago Bridge[31]
  • USS AFD-3 – AFDL-3 By Chicago Bridge[32]
  • USS AFD-4 – AFDL-4 By Chicago Bridge[33]
  • USS AFD-5 – AFDL-5 By Chicago Bridge[34]
  • USS Dynamic (AFD-6) – AFDL-6 By Chicago Bridge[35]
  • USS Ability (AFD-7) By Chicago Bridge[36]
  • USS AFD-8 – AFDL-8 By Chicago Bridge[37]
  • USS AFD-9 – AFDL-9 By Chicago Bridge, stationed at Naval Base Noumea[38]
  • USS AFD-10 – AFDL-10 By Chicago Bridge[39]
  • USS AFD-11 – AFDL-11 By Chicago Bridge[40]
  • USS AFD-12 – AFDL-12[41]
  • USS AFD-13 – AFDL-13 Typhoon Ida Sank off of Okinawa, Japan on 16 September 1945.[42]
  • USS AFD-14 – AFDL-14 served Espiritu Santo.[43]
  • USS AFD-15 – AFDL-15 served at Enewetak Atoll[44]
  • USS AFD-16 – AFDL-16[45]
  • USS AFD-17 – AFDL-17 served at Kwajalein Atoll[46]
  • USS AFD-18 – AFDL-18
  • USS AFD-19 – AFDL-19 By The Auchter Company served in Dunstaffnage a Scottish village, sold moved to Jacksonville, Florida[47]
  • USS AFD-20 – AFDL-20 By Auchter Company served American Samoa[48]
  • USS AFD-21 – AFDL-21 By Auchter Company[49]
  • USS AFD-22 – AFDL-22 By Auchter Company[50]
  • USS Adept (AFD-23) – AFDL-23 Auchter Company[51]
  • USS AFD-24 – AFDL-24 By Doullot & Ewin in Mobile, Alabama[52]
  • USS AFD-25 – AFDL-25 By Doullot & Ewin[53]
  • USS AFD-26 – AFDL-26 By Doullot & Ewin[54]
  • USS AFD-27 – AFDL-27 By Doullot & Ewin
  • USS AFD-28 – AFDL-28 By Doullot & Ewin[55]
  • USS AFD-29 – AFDL – AFDL-29 By Doullot & Ewin[56]
  • USS AFD-30 – AFDL-30 By Foundation Co. Scrapped in 1979.[57]
  • USS AFD-31 – AFDL-31 By Foundation Co. Later YFD 83. To US Coast Guard 1947. After war moved to Singapore.[58]
  • USS AFD-32 – AFDL-32 By Foundation Co.
  • USS AFD-33 – AFDL-33 By Foundation Co. To Peru 1959 as AFD 106. Active.
  • For AFDL-34 to AFDL-46 see: Auxiliary Repair Dock, Concrete

Auxiliary Repair Docks (ARD)

 
USS ARD-1 under tow by USS Bridge 28 October 1934.
 
ARD-6 submerged at Dutch Harbor Alaska with Sub USS S-46 for repair 1944

Auxiliary Repair Docks were built by Pacific Bridge Company in Alameda, California. ARD are 483 ft long, have a beam of 71 ft, a draft of 5 ft, and a displacement of 4,800 tons. The crew complement is 6 officers and 125 enlisted. ARD have an armament of two single Oerlikon 20 mm cannons, a bow and are sea worthy. They are self-sustaining with rudders to help in tow moving and have two cranes with a five-ton capacity. ARD also have a stowage barge for extra space. They were used to repair destroyers and submarines. Class 2 could repair Landing Ship, Tank (LST). The stern of the ship is open to allow a ship in need of repair to enter.[4][2][59]

Auxiliary Repair Dock, Concrete (ARDC)

 
ARDC-13, An Auxiliary Repair Dock, Concrete
 
Auxiliary Repair Dock, Concrete under tow

Auxiliary Repair Dock, Concrete were mobile dry docks made of concrete, due to the shortage of steel during World War II. ARDC had a 2,800 ton lifting capacity. ARDC were 389 ft long, 84 ft wide, and 40 ft deep. ARDC has a crew of five officers and 84 enlisted men. Each had a 5-ton crane, with a 42 ft reach. Eight were built at Wilmington, North Carolina, and five at San Pedro in Los Angeles, California.[93][94][95][2]

  • ARDC 1 – Changed to AFDL-34. Sold to Taiwan in 1959 Han Jih.
  • ARDC 2 – Changed to AFDL-35. Scrapped in 1974.
  • ARDC 3 – Changed to AFDL-36. Sold to Taiwan in 1947 Hay Tan. Scuttled in 2000.[96]
  • ARDC 4 – Changed to AFDL-37. Scrapped in 1981.
  • ARDC 5 – Changed to AFDL-38. Placed out of service, date unknown. Final Disposition, transferred to San Francisco Maritime National Historical Park and leased to Bay Ship and Yacht shipyard at Alameda, CA.[97]
  • ARDC 6 – Changed to AFDL-39. Sold to Brazil in 1980 Cidade de Natal.
  • ARDC 7 – Changed to AFDL-40. Sold to the Philippines in 1990.
  • ARDC 8 – Changed to AFDL-41. Sold in 1983 to North Florida Shipyard[98]
  • ARDC 9 – Changed to AFDL-42. Sold to Hurley Marine Works in 1945. Scrapped in 1975.
  • ARDC 10 – Changed to AFDL-43. Scrapped in 1979.[99]
  • ARDC 11 – Changed to AFDL-44. Sold to the Philippines in 1969.[100]
  • ARDC 12 – Changed to AFDL-45. Sold to Todd Seattle 1945. Sold 1981 to Puglia Engineering.
  • ARDC-13 – Changed to AFDL-46. Destroyed at Bikini in 1946.[101]

Yard Floating Dock (YFD)

 
YFD-2 The first Yard Floating Dock built in 1901, arriving Pearl Harbor 23 Oct. 1940 from New Orleans Naval Yard

Yard Floating Dock (YFD) was used for many types of floating docks, mostly used for harbor or shipyard use. YFDs normally had no or little crew space and were serviced from shore. Some auxiliary Repair Docks were converted to YFDs. Types of YFDs were: 400-ton concrete docks, 1,000-ton, 3,000-ton and 5,000-ton wood docks; sectional wood docks from 7,000 to 20,000 tons lifting capacity and a three-piece self docking steel sectional docks with 14,000 to 18,000 tons lifting capacity. All Medium Auxiliary Floating Dry Docks were converted to YFDs after World War II.[102][103][2]

  • USS YFD-3
  • USS YFD-4
  • USS YFD-5
  • USS YFD-6
  • USS YFD-7
  • USS YFD-8
  • USS YFD-9
  • USS YFD-10
  • USS YFD-11
  • USS YFD-12
  • USS YFD-13
  • USS YFD-14
  • USS YFD-15
  • USS YFD-16
  • USS YFD-17
  • USS YFD-18
  • USS YFD-19
  • USS YFD-20
  • USS YFD-21
  • USS YFD-22
  • USS YFD-23
  • USS YFD-24
  • USS YFD-25
  • USS YFD-26
  • USS YFD-27
  • USS YFD-28
  • USS YFD-29
  • USS YFD-30
  • USS YFD-31
  • USS YFD-32
  • USS YFD-33
  • USS YFD-34
  • USS YFD-35
  • USS YFD-36
  • USS YFD-37
  • USS YFD-38
  • USS YFD-39
  • USS YFD-40
  • USS YFD-41
  • USS YFD-42
  • USS YFD-43
  • USS YFD-44
  • USS YFD-45
  • USS YFD-46
  • USS YFD-47
  • USS YFD-48
  • USS YFD-49
  • USS YFD-50
  • USS YFD-51
  • USS YFD-52
  • USS YFD-53
  • USS YFD-54
  • USS YFD-55
  • USS YFD-56
  • USS YFD-57
  • USS YFD-58
  • USS YFD-59
  • USS YFD-60
  • USS YFD-61
  • USS YFD-62
  • USS YFD-63
  • USS YFD-64
  • USS YFD-65
  • USS YFD-66
  • USS YFD-67
  • USS YFD-68
  • USS YFD-69
  • USS YFD-70
  • USS YFD-71
  • USS YFD-72
  • USS YFD-73
  • USS YFD-74
  • USS YFD-75
  • USS YFD-76
  • USS YFD-77
  • USS YFD-78
  • USS YFD-79
  • USS YFD-80
  • USS YFD-81
  • USS YFD-82

Image gallery

See also

References

  1. ^ The Pacific War Online Encyclopedia, Floating Dry Docks
  2. ^ a b c d e f g h i j Building the Navy's Bases in World War II, History of the Bureau of Yards and Docks and the Civil Engineer Corps 1940-1946 Chapter IX, Floating Drydocks
  3. ^ a b navsource, YFD-2
  4. ^ a b c d e f "Floating Dry-Docks (AFDB, AFDM, AFDL, ARD, ARDM, YFD)". shipbuildinghistory.com. 30 April 2015. Retrieved 8 January 2019.
  5. ^ USS ABSD-1 [1943-1946]
  6. ^ "Sea Going Navy Yard Follows The Fleet", November 1945, Popular Science
  7. ^ navsource, Artisan (AFDB-1)
  8. ^ southpacificwwiimuseum.com, ABSD-1 Floating Dry Dock on Espiritu Santo, A glimpse of WWII history
  9. ^ pacificwrecks, USS AFDB-2
  10. ^ https://southpacificwwiimuseum.com/absd/ The USS ABSD-1
  11. ^ navsource, USS AFDB-3
  12. ^ Photos of USS Samuel B. Roberts on blocks in AFDB-3 in 1988
  13. ^ Pacific Wrecks - AFDB-4 / ABSD-4 Auxiliary Floating Dry Dock 4
  14. ^ navsource, navsource, ABSD-4
  15. ^ USS AFDB-5
  16. ^ navsource, USS AFDB-6
  17. ^ navsource, AFDM Medium Auxiliary Floating Dry Dock
  18. ^ navsource, Medium Auxiliary Floating Dry Docks (AFDM)
  19. ^ USN Floating Dry Dock AFDM-1 in the Miraflores Locks, August 11, 2013
  20. ^ navsource, AFDM-1
  21. ^ navsource, USS AFDM-3
  22. ^ navsource, USS Resourceful (AFDM-5)
  23. ^ Global security AFDB Auxiliary Floating Dry Dock, Large
  24. ^ navsource, USS Competent (AFDM-6)
  25. ^ navsource, USS Sustain (AFDM-7)
  26. ^ navsource, USS Richland (AFDM-8)
  27. ^ navsource, USS AFDM-9
  28. ^ navsource, USS Steadfast (AFDM-14)
  29. ^ navsource.org, USS Ability (AFDL-7)
  30. ^ US Navy, AFDL: SMALL AUXILIARY FLOATING DRY DOCK (N-S-P)
  31. ^ navsource, USS AFD-2
  32. ^ navsource, USS AFD-3
  33. ^ navsource, USS AFD-4
  34. ^ navsource, USS AFD-5
  35. ^ navsource, USS Dynamic (AFD-6)
  36. ^ navsource, USS Ability (AFD-7)
  37. ^ navsource, USS AFD-8
  38. ^ navsource, USS AFD-9
  39. ^ navsource, USS AFD-10
  40. ^ navsource, USS AFD-11
  41. ^ USS AFD-12
  42. ^ . history.navy.mil. Archived from the original on 10 April 2014. Retrieved 9 March 2014.
  43. ^ Beans, Bullets, and Black Oil, By Rear Adm. Worrall Reed Carter, page repair
  44. ^ Beans, Bullets, and Black Oil, By Rear Adm. Worrall Reed Carter, page Enewetak Atoll July 1944
  45. ^ navsource, USS AFD-16
  46. ^ Beans, Bullets, and Black Oil, By Rear Adm. Worrall Reed Carter, page Kwajalein Atoll Sept. 1944
  47. ^ Dunstaffnage, war years
  48. ^ Fold3.com, War Diary, 1/1-31/45, Page 1
  49. ^ navsource, USS AFD-21
  50. ^ navsource, USS AFD-22
  51. ^ navsource,USS Adept (AFD-23)
  52. ^ USS AFD-24
  53. ^ US Navy AFDL 25
  54. ^ USS AFD-26
  55. ^ navsource, USS AFD-28
  56. ^ Dictionary of American Naval Fighting Ships, edited by James L. Mooney, page 709
  57. ^ navsource, USS AFD-30
  58. ^ HMS ST BRIDES BAY (K 600) - Bay-class Frigate
  59. ^ NAVY DEPARTMENT, MANUAL OF ADVANCED BASE DEVELOPMENT AND MAINTENANCE, APRIL 1945
  60. ^ navsource, USS ARD-1
  61. ^ navsource, USS ARD-2
  62. ^ navsource, USS ARD-3
  63. ^ navsource, USS ARD-4
  64. ^ navsource, USS ARD-5
  65. ^ navsource, USS ARD-6
  66. ^ USS ARD-7
  67. ^ navsource, USS ARD-8
  68. ^ navsource, ARD-9
  69. ^ navsource, ARD-10
  70. ^ navsource, ARD-11
  71. ^ ARD-12
  72. ^ ARD-13
  73. ^ navsource, USS ARD-14
  74. ^ USS ARD-15
  75. ^ navsource, USS ARD-16
  76. ^ USS ARD-17
  77. ^ navsource, USS Endurance ARD-18 ARDM 3
  78. ^ USS Oak Ridge (ARDM-1) ARD-19
  79. ^ navsource, USS White Sands (ARD-20)
  80. ^ navsource, USS ARD-21
  81. ^ navsource, USS ARD-22 Windsor
  82. ^ navsource, USS ARD-23
  83. ^ USS ARD-24
  84. ^ USS ARD-25
  85. ^ navsource, USS Alamogordo (ARDM-2) ARD-26
  86. ^ USS ARD-27
  87. ^ navsource, USS ARD-28
  88. ^ USS Arco (ARD-29)
  89. ^ navsource, USS ARD-30, USS San Onfre
  90. ^ navsource, USS ARD-31
  91. ^ navsource, USS ARD-32
  92. ^ navsource, USS ARD-33 - AFDL 47, Reliance
  93. ^ "Final Report for Tests Able and Baker". Joint Task Force One. Bureau of Yards and Docks Group. 1946.
  94. ^ Dictionary of American Naval Fighting Ships: V. 6: R Through S, Appendices, By James L. Mooney.
  95. ^ Global security, Auxiliary Classes
  96. ^ navsource, ARDC 3
  97. ^ navsource, ARDC 5
  98. ^ navsource, ARDC 8
  99. ^ navsource, ARDC 10
  100. ^ navsource, ARDC 11
  101. ^ navsource, ARDC-13
  102. ^ navsource, Yard Floating Dock (YFD)
  103. ^ The Navy of the Nuclear Age, 1947–2007, By Paul Silverstone
  104. ^ US Navy, YFD-2
  105. ^ National Park Service, Civilian Casualties, YFD-2
  106. ^ US Navy, Floating Drydock Resolute Ends 58 Years of Service to Navy, Story Number: NNS031107-31Release Date: 11/7/2003 11:40:00 PM, By Chief Journalist (SW/AW) Mark O. Piggott, Commander, Submarine Force, U.S. Atlantic Fleet Public Affairs

External links

  • This article includes information collected from the Naval Vessel Register, which, as a U.S. government publication, is in the public domain. The entries can be found here and here. – sections a, g, h, i, j, and e
  • This article includes information collected from the Naval Vessel Register, which, as a U.S. government publication, is in the public domain. The entry can be found here. – section f
  • This article includes information collected from the Naval Vessel Register, which, as a U.S. government publication, is in the public domain. The entries can be found here and here. – IX-521 and IX-525
  • Youtube, BATTLESHIP USS IDAHO REPAIRED AT ESPIRITU SANTO in 1944 in USS Artisan (ABSD-1)1
  • Youtube, August 15, 1944 mighty battleship Idaho at ABSD-1
  • Youtube, Floating Dry Docks WWII
  • US Navy, Beans, Bullets, and Black Oil, The Story of Fleet Logistics Afloat in the Pacific During World War II

auxiliary, floating, drydock, auxiliary, floating, drydock, type, navy, floating, dock, floating, docks, able, submerge, underwater, placed, under, ship, need, repair, below, water, line, water, then, pumped, floating, dock, raising, ship, water, ship, becomes. An auxiliary floating drydock is a type of US Navy floating dry dock Floating dry docks are able to submerge underwater and to be placed under a ship in need of repair below the water line Water is then pumped out of the floating dry dock raising the ship out of the water The ship becomes blocked on the deck of the floating dry dock for repair Most floating dry docks have no engine and are towed by tugboats to their destinations Floating dry docks come in different sizes to accommodate varying ship sizes while large floating dry docks come in sections and can be combined to increase their size and lift power Ballast pontoon tanks are flooded with water to submerge or pumped dry to raise the ship 1 2 USS Artisan ABSD 1 with USS Antelope IX 109 and LST 120 in the dock at Espiritu Santo New Hebrides Islands 8 January 1945 Los Alamos AFDB 7 with a repaired submarine at Holy Loch Scotland in 1985 YFD 2 The first Yard Floating Dock built in 1901 arriving Pearl Harbor 23 Oct 1940 from New Orleans Naval Yard USS Pennsylvania in drydock USS Dewey the second YFD c 1906 1907 Contents 1 World War II 2 Role 3 Armament 4 Large Auxiliary Floating Dry Docks AFDB 5 Medium Auxiliary Floating Dry Docks AFDM 6 Medium Auxiliary Repair Docks ARDM 7 Small Auxiliary Floating Dry Docks AFD AFDL 8 Auxiliary Repair Docks ARD 9 Auxiliary Repair Dock Concrete ARDC 10 Yard Floating Dock YFD 11 Image gallery 12 See also 13 References 14 External linksWorld War II EditAt the start of World War II the US Navy had only three steel auxiliary floating dry docks Auxiliary floating drydock YFD 2 built in 1901 was at Pearl Harbor YFD 2 was repairing the US destroyer USS Shaw on 7 December 1941 during the attack on the harbor Both YFD 2 and USS Shaw were repaired after being hit and damaged in the attack 3 The auxiliary floating drydock USS Dewey built in 1905 was scuttled at Mariveles to prevent its capture by the Japanese In 1942 Japan raised the Dewey but it was resunk by US forces Auxiliary floating dry dock USS ARD 1 built in 1933 was also at Pearl Harbor USS ARD 1 was a self sustaining mobile dry dock To reduce travel time for repair work over 150 auxiliary floating dry docks of different sizes were built during World War II between 1942 and 1945 These newly built floating dry docks had a lift capacity of 400 to 100 000 tons Without these forward repair bases ships would have had to return to the US for repairs Between 1 October 1944 and 17 October 1945 7 000 ships were repaired in auxiliary floating dry docks After World War II some auxiliary floating dry docks were sold for private use and others were scrapped In addition to auxiliary floating dry docks timber floating dry docks were built for use in World War II Timber floating dry docks had a lift capacity of 400 to 20 000 tons They were not towed across the open ocean and were not given a US Navy class 4 2 Role EditDuring wartime ships in continuous use need repair both from wear and from war damage such as from naval mines kamikaze attacks dive bombs and torpedoes Rudders and propellers are best serviced on dry docks Without remote on location dry docks months could be lost if a ship returned to a home port for repair Most auxiliary floating drydocks had provisions for the repair crew including bunk beds meals and laundry Most had power stations ballast pumps repair shops machine shops and mess halls to be self sustaining Some auxiliary floating drydocks also had provisions for the ship under repair but when possible the crew of the damaged ship remained on ship while repairs were done Many had cranes able to lift tons of material and parts to remove damaged parts and to install new parts 5 2 Armament EditMost auxiliary floating drydocks had only anti aircraft guns for defense as space would not allow for large guns Typical armaments included 40 mm and 20 mm machine guns Japanese pilots sometimes mistook empty auxiliary floating drydocks for aircraft carriers 6 2 Large Auxiliary Floating Dry Docks AFDB Edit USS AFDB 3 with rail traveling 15 ton crane Auxiliary Floating Docks Big AFDB also known as Advance Base Sectional Docks ABSD came in sections 93 ft long and 3 850 tons each Each section had a 165 ft beam a 75 ft molded depth and 10 000 tons of lifting capacity Sections could be put together to lift larger ships AFDB were needed to repair battleships aircraft carriers cruisers and large auxiliary ships The AFDB 1 Artisan had 10 sections A to J for a total lift of 100 000 tons and was 1 000 ft long with all 10 sections installed AFDB 1 to 7 were built between 1943 and 1945 and towed to remote navy bases An AFDB would have a crew of 600 to 1 000 men a fresh water distilling plant and was otherwise self sustaining They had a rail traveling 15 ton capacity crane with an 85 foot radius and two or more support barges To pump water from the tanks there were two 24 in discharge pumps on each section each pump rated 15 000 gpm For electricity there were two 350 kw diesel AC generators on each section producing 440 volts 3 phase 60 cycle power AFDBs had steam plants to run the pumps Each section could store 65 000 gallons of fuel oil to supply the ships under repair Crew lived in barracks ships called APL that docked next to the AFDB 4 7 2 8 USS Artisan ABSD 1 A J built by Everett Pacific and others USS AFDB 2 A J built by Mare Island Naval Shipyard in Vallejo California E F H amp I in use 9 10 USS AFDB 3 A I saw fighting action in Guam and was sold to Croatia in 2000 11 12 USS AFDB 4 A G built by Mare Island Naval Ship Yard NSY Attacked by air on April 27 1945 Partially sunk 1989 as a reef 13 14 USS AFDB 5 A G built by Chicago Bridge in Morgan City Louisiana Scrapped in 1997 15 USS AFDB 6 A G built by Mare Island NSY Scrapped 1976 16 USS Los Alamos AFDB 7 A G built by Chicago Bridge Sold to a private shipyard in 1995 Post WW2 AFDB 8 Machinist built by Seebeckwerft in Germany Sold to Guam in 1997 AFDB 9 A B built by Sun Shipbuilding in Chester Pennsylvania Sold to private owners in Galveston in 1985 Medium Auxiliary Floating Dry Docks AFDM Edit USS Richland YFD 64 YFD 6 center section floated through the Panama Canal on its side Towed by USS Alarka YTB 229 center and USS Umpqua ATA 209 left in 1945 Navy SeaBees turned it on its side with many pontoons to fit through the canal AFDM are from 6 800 to 8 000 tons and are from 528 to 622 feet long An AFDM has a crew of 140 to 200 men An AFDM had a lift capacity 18 000 tons and was armed with two 40 mm and four 20 mm guns It also had two 7 1 2 ton cranes with 16 ballast tank compartments AFDMs were built in three pieces a long center section and two shorter sections one at each end 4 17 2 18 All AFDM also had Yard Floating Docks YFD class numbers USS AFDM 1 Chicago Bridge YFD 3 Was floated through the Panama Canal on it side and scrapped in 1986 19 USS AFDM 2 Alabama DD YFD 4 Sold to private users in 1999 20 USS AFDM 3 Chicago Bridge through the Panama Canal on it side to Naval Base Trinidad YFD 6 Sold to private users 21 USS AFDM 4 Chicago Bridge YFD 10 Sold to private users in 1948 USS Resourceful AFDM 5 Everett Pacific YFD 21 Sold to private users in 1999 22 USS Competent AFDM 6 Everett Pacific YFD 62 Sold to private users in 1997 23 24 USS Sustain AFDM 7 Everett Pacific YFD 63 Leased to BAE Systems Southeast Shipyards in 1997 25 USS Richland AFDM 8 Chicago Bridge YFD 64 scrapped in 2016 26 USS AFDM 9 Chicago Bridge YFD 65 Sold to private users in 1989 USS Resolute AFDM 10 Chicago Bridge YFD 67 Destroyed in 1947 27 USS AFDM 11 Chicago Bridge YFD 68 Sold to private users in 2004 USS AFDM 12 Kaiser Shipyards in Vancouver Washington YFD 69 Scrapped in 1990 USS AFDM 13 See YFD 70 Columbia Const in Vancouver WA Sold to private users in 1969 USS Steadfast AFDM 14 USS Kinkaid DD 965 in floating drydock Steadfast Pollock Stockton in Stockton California YFD 71 Sold to private users in 1998 28 Medium Auxiliary Repair Docks ARDM Edit USS Oak Ridge ARDM 1 Auxiliary repair dock Mobile ARDM are 5 200 tons and 489 feet long ARDs had a ship form hull and lifting capacity of 3 500 tons ARDMs were used to repair destroyers submarines and small auxiliaries ARDMs had a crew of 130 to 160 men 4 2 USS Oak Ridge ARDM 1 by Pacific Bridge Company Now in US Coast Guard USS Alamogordo ARDM 2 by Pacific Bridge Now in Ecuador USS Endurance ARDM 3 by Pacific Bridge Now in South America Post WW2 USS Shippingport ARDM 4 by Bethlehem Steel US Navy Active USS Arco ARDM 5 by Todd Pacific Shipyards in Seattle WA US Navy Active Small Auxiliary Floating Dry Docks AFD AFDL Edit USS Dynamic AFD 6 AFDL 6 at Virginia Beach Va on Nov 2 2006 Auxiliary Floating Docks Light AFDL also known as Auxiliary Floating Docks AFD were 288 ft long had a beam of 64 ft 20 m and draft of 3 ft 3 in 0 99 m empty and 31 ft 4 in 9 55 m flooded to load a ship A normal crew was 60 men AFDL displacement was 1 200 tons and could lift 1 900 tons AFDL were built as one piece open at both ends AFDL were used to repair small craft PT boats and small submarines All AFD were reclassified AFDL after the war in 1946 4 29 30 USS Adept AFD 23 USS Endeavor AFD 1 AFDL 1 By Chicago Bridge USS AFD 2 By Chicago Bridge 31 USS AFD 3 AFDL 3 By Chicago Bridge 32 USS AFD 4 AFDL 4 By Chicago Bridge 33 USS AFD 5 AFDL 5 By Chicago Bridge 34 USS Dynamic AFD 6 AFDL 6 By Chicago Bridge 35 USS Ability AFD 7 By Chicago Bridge 36 USS AFD 8 AFDL 8 By Chicago Bridge 37 USS AFD 9 AFDL 9 By Chicago Bridge stationed at Naval Base Noumea 38 USS AFD 10 AFDL 10 By Chicago Bridge 39 USS AFD 11 AFDL 11 By Chicago Bridge 40 USS AFD 12 AFDL 12 41 USS AFD 13 AFDL 13 Typhoon Ida Sank off of Okinawa Japan on 16 September 1945 42 USS AFD 14 AFDL 14 served Espiritu Santo 43 USS AFD 15 AFDL 15 served at Enewetak Atoll 44 USS AFD 16 AFDL 16 45 USS AFD 17 AFDL 17 served at Kwajalein Atoll 46 USS AFD 18 AFDL 18 USS AFD 19 AFDL 19 By The Auchter Company served in Dunstaffnage a Scottish village sold moved to Jacksonville Florida 47 USS AFD 20 AFDL 20 By Auchter Company served American Samoa 48 USS AFD 21 AFDL 21 By Auchter Company 49 USS AFD 22 AFDL 22 By Auchter Company 50 USS Adept AFD 23 AFDL 23 Auchter Company 51 USS AFD 24 AFDL 24 By Doullot amp Ewin in Mobile Alabama 52 USS AFD 25 AFDL 25 By Doullot amp Ewin 53 USS AFD 26 AFDL 26 By Doullot amp Ewin 54 USS AFD 27 AFDL 27 By Doullot amp Ewin USS AFD 28 AFDL 28 By Doullot amp Ewin 55 USS AFD 29 AFDL AFDL 29 By Doullot amp Ewin 56 USS AFD 30 AFDL 30 By Foundation Co Scrapped in 1979 57 USS AFD 31 AFDL 31 By Foundation Co Later YFD 83 To US Coast Guard 1947 After war moved to Singapore 58 USS AFD 32 AFDL 32 By Foundation Co USS AFD 33 AFDL 33 By Foundation Co To Peru 1959 as AFD 106 Active For AFDL 34 to AFDL 46 see Auxiliary Repair Dock ConcreteAuxiliary Repair Docks ARD Edit USS ARD 1 under tow by USS Bridge 28 October 1934 USS Waterford ARD 5 ARD 6 submerged at Dutch Harbor Alaska with Sub USS S 46 for repair 1944 Auxiliary Repair Docks were built by Pacific Bridge Company in Alameda California ARD are 483 ft long have a beam of 71 ft a draft of 5 ft and a displacement of 4 800 tons The crew complement is 6 officers and 125 enlisted ARD have an armament of two single Oerlikon 20 mm cannons a bow and are sea worthy They are self sustaining with rudders to help in tow moving and have two cranes with a five ton capacity ARD also have a stowage barge for extra space They were used to repair destroyers and submarines Class 2 could repair Landing Ship Tank LST The stern of the ship is open to allow a ship in need of repair to enter 4 2 59 USS ARD 1 Displacement of 2 200 tons Built in 1933 Only one in class 60 USS ARD 2 stationed at Naval Base Noumea Sold in 1963 61 USS ARD 3 Sold in 1999 62 USS ARD 4 Sold in 1961 63 ARD 2 class 410 ft long 49 ft 4 in wide ARD 5 to 11 USS Waterford ARD 5 64 USS ARD 6 Sold in 1961 65 USS West Milton ARD 7 Scrapped in 1992 66 USS ARD 8 Sold in 1961 67 USS ARD 9 Sold 1977 68 USS ARD 10 Sold scrapped in 2014 69 USS ARD 11 Sold 1977 70 ARD 2 class wide 410 feet long 49 feet 4 inches 59 feet 3 inches wide ARD 12 to 32 USS ARD 12 Sold in 1987 71 USS ARD 13 Sold in 1977 72 USS ARD 14 Sold in 1980 73 USS ARD 15 Sold in 1971 74 USS ARD 16 By Pacific Bridge Sold and moved to Mobile AL 75 USS ARD 17 Sold in 1971 76 USS Endurance ARD 18 ARDM 3 Laid up at Charleston Naval Shipyard 77 USS Oak Ridge ARD 19 ARDM 1 To United States Coast Guard in 2002 78 USS White Sands ARD 20 By Pacific Bridge Co changed to AGDS 1 Sold in 1974 79 USS ARD 21 Reserve 80 USS Windsor ARD 22 Sold in 1976 81 USS ARD 23 Sold in 1992 82 USS ARD 24 Sold in 1982 83 USS ARD 25 Sold in 1973 84 USS Alamogordo ARD 26 Sold in 2000 85 USS ARD 27 Scrapped in 1974 86 USS ARD 28 Sold and renamed Capitan Rodriguez Zamora 87 USS Arco ARD 29 Sold to Iran in 1971 88 USS San Onfre ARD 30 By Pacific Bridge Co 89 USS ARD 31 To US Air Force in 1974 90 USS ARD 32 Sold in 1960 91 USS ARD 33 By Dravo Corp Renamed AFDL 47 Reliance 92 Auxiliary Repair Dock Concrete ARDC Edit ARDC 13 An Auxiliary Repair Dock Concrete Auxiliary Repair Dock Concrete under tow Auxiliary Repair Dock Concrete were mobile dry docks made of concrete due to the shortage of steel during World War II ARDC had a 2 800 ton lifting capacity ARDC were 389 ft long 84 ft wide and 40 ft deep ARDC has a crew of five officers and 84 enlisted men Each had a 5 ton crane with a 42 ft reach Eight were built at Wilmington North Carolina and five at San Pedro in Los Angeles California 93 94 95 2 ARDC 1 Changed to AFDL 34 Sold to Taiwan in 1959 Han Jih ARDC 2 Changed to AFDL 35 Scrapped in 1974 ARDC 3 Changed to AFDL 36 Sold to Taiwan in 1947 Hay Tan Scuttled in 2000 96 ARDC 4 Changed to AFDL 37 Scrapped in 1981 ARDC 5 Changed to AFDL 38 Placed out of service date unknown Final Disposition transferred to San Francisco Maritime National Historical Park and leased to Bay Ship and Yacht shipyard at Alameda CA 97 ARDC 6 Changed to AFDL 39 Sold to Brazil in 1980 Cidade de Natal ARDC 7 Changed to AFDL 40 Sold to the Philippines in 1990 ARDC 8 Changed to AFDL 41 Sold in 1983 to North Florida Shipyard 98 ARDC 9 Changed to AFDL 42 Sold to Hurley Marine Works in 1945 Scrapped in 1975 ARDC 10 Changed to AFDL 43 Scrapped in 1979 99 ARDC 11 Changed to AFDL 44 Sold to the Philippines in 1969 100 ARDC 12 Changed to AFDL 45 Sold to Todd Seattle 1945 Sold 1981 to Puglia Engineering ARDC 13 Changed to AFDL 46 Destroyed at Bikini in 1946 101 Yard Floating Dock YFD Edit YFD 2 The first Yard Floating Dock built in 1901 arriving Pearl Harbor 23 Oct 1940 from New Orleans Naval Yard Yard Floating Dock YFD was used for many types of floating docks mostly used for harbor or shipyard use YFDs normally had no or little crew space and were serviced from shore Some auxiliary Repair Docks were converted to YFDs Types of YFDs were 400 ton concrete docks 1 000 ton 3 000 ton and 5 000 ton wood docks sectional wood docks from 7 000 to 20 000 tons lifting capacity and a three piece self docking steel sectional docks with 14 000 to 18 000 tons lifting capacity All Medium Auxiliary Floating Dry Docks were converted to YFDs after World War II 102 103 2 USS Dewey YFD 1 Built in 1905 USS YFD 2 Built in 1901 Damaged in the attack at Pearl Harbor on 7 December 1941 Repaired 3 104 105 USS Richland YFD 64 USS YFD 67 A medium auxiliary floating dry dock Retired in 2003 106 USS YFD 3 USS YFD 4 USS YFD 5 USS YFD 6 USS YFD 7 USS YFD 8 USS YFD 9 USS YFD 10 USS YFD 11 USS YFD 12 USS YFD 13 USS YFD 14 USS YFD 15 USS YFD 16 USS YFD 17 USS YFD 18 USS YFD 19 USS YFD 20 USS YFD 21 USS YFD 22 USS YFD 23 USS YFD 24 USS YFD 25 USS YFD 26 USS YFD 27 USS YFD 28 USS YFD 29 USS YFD 30 USS YFD 31 USS YFD 32 USS YFD 33 USS YFD 34 USS YFD 35 USS YFD 36 USS YFD 37 USS YFD 38 USS YFD 39 USS YFD 40 USS YFD 41 USS YFD 42 USS YFD 43 USS YFD 44 USS YFD 45 USS YFD 46 USS YFD 47 USS YFD 48 USS YFD 49 USS YFD 50 USS YFD 51 USS YFD 52 USS YFD 53 USS YFD 54 USS YFD 55 USS YFD 56 USS YFD 57 USS YFD 58 USS YFD 59 USS YFD 60 USS YFD 61 USS YFD 62 USS YFD 63 USS YFD 64 USS YFD 65 USS YFD 66 USS YFD 67 USS YFD 68 USS YFD 69 USS YFD 70 USS YFD 71 USS YFD 72 USS YFD 73 USS YFD 74 USS YFD 75 USS YFD 76 USS YFD 77 USS YFD 78 USS YFD 79 USS YFD 80 USS YFD 81 USS YFD 82Image gallery Edit USS Abraham Lincoln SSBN 602 in USS AFDB 7 One Advance Base Sectional Dock ABSD section under tow with float wings up in 1944 ABSD 5 at Manicani Island Philippines repairing the USS Mississippi in July 1945 USS Makin Island CVE 93 halfway into USS ABSD 6 at Guam 8 June 1945 USS LST 646 and USS LST 662 in ABSD 6 in Apra Harbor Guam 29 May 1945 USS ABSD 6 being assembled at Apra Harbor Guam in 1945 USS ABSD 3 at Guam to the rear right of ABSD 3 is the land base that supported ABSD 6 and ABSD 3 crew USS Octans AF 26 in YFD 18 at San Francisco on 15 June 1943 USS Iowa BB 61 Floating Drydock USS AFDB 2 at Seeadler Harbor in 1945 ABSD 6 s Section D and one crane under tow to Guam pontoons are folded down to reduce wind resistance and lower center of gravity ABSD 3 repairing small ships at the same time at Guam in 1945 Columbia CL 56 docked in Artisan ABSD 1 Columbia docked upon Artisan AFDB 1 with West Virginia BB 48 high and dry in the dock Los Alamos AFDB 7 USS Pennsylvania ACR 4 in Drydock Dewey c 1906 1907 USS Maryland ACR 8 in Drydock Dewey c 1907 USS Chauncey DD 3 in Drydock Dewey c 1910 USS Chauncey DD 3 in Drydock Dewey stern view c 1910 US Navy submarines in Drydock Dewey c 1912 US Navy submarines in Drydock Dewey c 1912 USS Galveston CL 19 in Drydock Dewey c 1916 Aerial view of the Dewey Drydock with USS Jason AV 2 nearby October 1928 Aerial view of USS Jason AV 2 in Drydock Dewey 8 March 1932 Side view of USS Jason AV 2 in Drydock Dewey 9 March 1932 Official crest of Arco ARDM 5 Los Angeles class fast attack submarine USS Asheville SSN 758 enters the floating dry dock of Arco ARDM 5 for scheduled maintenance See also EditDry dock Heavy lift ship Hughes Mining Barge PD 50 Russia s largest floating dry dock Semi submersible naval vessel Semi submersible platform List of auxiliaries of the United States NavyReferences Edit The Pacific War Online Encyclopedia Floating Dry Docks a b c d e f g h i j Building the Navy s Bases in World War II History of the Bureau of Yards and Docks and the Civil Engineer Corps 1940 1946 Chapter IX Floating Drydocks a b navsource YFD 2 a b c d e f Floating Dry Docks AFDB AFDM AFDL ARD ARDM YFD shipbuildinghistory com 30 April 2015 Retrieved 8 January 2019 USS ABSD 1 1943 1946 Sea Going Navy Yard Follows The Fleet November 1945 Popular Science navsource Artisan AFDB 1 southpacificwwiimuseum com ABSD 1 Floating Dry Dock on Espiritu Santo A glimpse of WWII history pacificwrecks USS AFDB 2 https southpacificwwiimuseum com absd The USS ABSD 1 navsource USS AFDB 3 Photos of USS Samuel B Roberts on blocks in AFDB 3 in 1988 Pacific Wrecks AFDB 4 ABSD 4 Auxiliary Floating Dry Dock 4 navsource navsource ABSD 4 USS AFDB 5 navsource USS AFDB 6 navsource AFDM Medium Auxiliary Floating Dry Dock navsource Medium Auxiliary Floating Dry Docks AFDM USN Floating Dry Dock AFDM 1 in the Miraflores Locks August 11 2013 navsource AFDM 1 navsource USS AFDM 3 navsource USS Resourceful AFDM 5 Global security AFDB Auxiliary Floating Dry Dock Large navsource USS Competent AFDM 6 navsource USS Sustain AFDM 7 navsource USS Richland AFDM 8 navsource USS AFDM 9 navsource USS Steadfast AFDM 14 navsource org USS Ability AFDL 7 US Navy AFDL SMALL AUXILIARY FLOATING DRY DOCK N S P navsource USS AFD 2 navsource USS AFD 3 navsource USS AFD 4 navsource USS AFD 5 navsource USS Dynamic AFD 6 navsource USS Ability AFD 7 navsource USS AFD 8 navsource USS AFD 9 navsource USS AFD 10 navsource USS AFD 11 USS AFD 12 Casualties Navy amp Coast Guard ships WWII history navy mil Archived from the original on 10 April 2014 Retrieved 9 March 2014 Beans Bullets and Black Oil By Rear Adm Worrall Reed Carter page repair Beans Bullets and Black Oil By Rear Adm Worrall Reed Carter page Enewetak Atoll July 1944 navsource USS AFD 16 Beans Bullets and Black Oil By Rear Adm Worrall Reed Carter page Kwajalein Atoll Sept 1944 Dunstaffnage war years Fold3 com War Diary 1 1 31 45 Page 1 navsource USS AFD 21 navsource USS AFD 22 navsource USS Adept AFD 23 USS AFD 24 US Navy AFDL 25 USS AFD 26 navsource USS AFD 28 Dictionary of American Naval Fighting Ships edited by James L Mooney page 709 navsource USS AFD 30 HMS ST BRIDES BAY K 600 Bay class Frigate NAVY DEPARTMENT MANUAL OF ADVANCED BASE DEVELOPMENT AND MAINTENANCE APRIL 1945 navsource USS ARD 1 navsource USS ARD 2 navsource USS ARD 3 navsource USS ARD 4 navsource USS ARD 5 navsource USS ARD 6 USS ARD 7 navsource USS ARD 8 navsource ARD 9 navsource ARD 10 navsource ARD 11 ARD 12 ARD 13 navsource USS ARD 14 USS ARD 15 navsource USS ARD 16 USS ARD 17 navsource USS Endurance ARD 18 ARDM 3 USS Oak Ridge ARDM 1 ARD 19 navsource USS White Sands ARD 20 navsource USS ARD 21 navsource USS ARD 22 Windsor navsource USS ARD 23 USS ARD 24 USS ARD 25 navsource USS Alamogordo ARDM 2 ARD 26 USS ARD 27 navsource USS ARD 28 USS Arco ARD 29 navsource USS ARD 30 USS San Onfre navsource USS ARD 31 navsource USS ARD 32 navsource USS ARD 33 AFDL 47 Reliance Final Report for Tests Able and Baker Joint Task Force One Bureau of Yards and Docks Group 1946 Dictionary of American Naval Fighting Ships V 6 R Through S Appendices By James L Mooney Global security Auxiliary Classes navsource ARDC 3 navsource ARDC 5 navsource ARDC 8 navsource ARDC 10 navsource ARDC 11 navsource ARDC 13 navsource Yard Floating Dock YFD The Navy of the Nuclear Age 1947 2007 By Paul Silverstone US Navy YFD 2 National Park Service Civilian Casualties YFD 2 US Navy Floating Drydock Resolute Ends 58 Years of Service to Navy Story Number NNS031107 31Release Date 11 7 2003 11 40 00 PM By Chief Journalist SW AW Mark O Piggott Commander Submarine Force U S Atlantic Fleet Public AffairsExternal links EditThis article includes information collected from theNaval Vessel Register which as a U S government publication is in the public domain The entries can be found here and here sections a g h i j and e This article includes information collected from theNaval Vessel Register which as a U S government publication is in the public domain The entry can be found here section f This article includes information collected from theNaval Vessel Register which as a U S government publication is in the public domain The entries can be found here and here IX 521 and IX 525 Youtube BATTLESHIP USS IDAHO REPAIRED AT ESPIRITU SANTO in 1944 in USS Artisan ABSD 1 1 Youtube August 15 1944 mighty battleship Idaho at ABSD 1 Youtube Floating Dry Docks WWII US Navy Beans Bullets and Black Oil The Story of Fleet Logistics Afloat in the Pacific During World War II Wikimedia Commons has media related to Floating drydocks of the United States Navy Retrieved from https en wikipedia org w index php title Auxiliary floating drydock amp oldid 1128220561 Large Auxiliary Floating Dry Docks AFDB, wikipedia, wiki, book, books, library,

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