Deep sea mining

Not to be confused with Naval mine.

Deep sea mining is the extraction of minerals from the ocean floor at depths of 200 metres (660 ft)^[1][2] to 6,500 metres (21,300 ft).^[3][4][5]

Schematic of a polymetallic nodule mining operation. From top to bottom, the three zoom-in panels illustrate the surface operation vessel, the midwater sediment plume, and the nodule collector operating on the seabed. The midwater plume comprises two stages: (i) the dynamic plume, in which the sediment-laden discharge water rapidly descends and dilutes to a neutral buoyancy depth, and (ii) the subsequent ambient plume that is advected by the ocean current and subject to background turbulence and settling. (MIT/2021)

Deep-sea mining uses hydraulic pumps or bucket systems that carry deposits to the surface for processing.

The environmental impact of deep sea mining is disputed.^[6][7] Environmental advocacy groups such as Greenpeace and the Deep Sea Mining Campaign^[8] claimed that seabed mining has the potential to damage deep sea ecosystems and spread pollution from heavy metal-laden plumes.^[9] Critics have called for moratoria^[10][11] or permanent bans.^[12] Opposition campaigns enlisted the support of some industry figures, including firms reliant on the target metals. Individual countries with significant deposits within their exclusive economic zones (EEZ's) are exploring the subject.^[13][14]

As of 2022, no commercial deep sea mining was underway. However, the International Seabed Authority granted 19 exploration licenses for polymetallic nodules within the Clarion Clipperton Zone.^[15] China has exclusive rights to mine 92,000 square miles (240,000 km²) or 17 percent of the area. Mining is set to begin in 2025.^[16] In 2022 the Cook Islands Seabed Minerals Authority (SBMA) granted 3 exploration licenses for polymetallic nodules within their EEZ.^[17] Papua New Guinea was the first country to approve a DSM permit, to Solwara 1, even though three independent reviews of the environmental impact statement mine alleged significant gaps and flaws in the underlying science.^[18]

Related technologies include robotic mining machines, as surface ships, and offshore and onshore metal refineries.^[19][20]

Wind farms, solar energy, electric cars, and battery technologies use many of the deep-sea metals.^[19]

As of 2021, the majority of marine mining used dredging operations at depths of about 200 m, where sand, silt and mud for construction purposes is abundant, along with mineral rich sands containing ilmenite and diamonds.^[21][22]

Sites

Deep sea mining sites hold polymetallic nodules or surround active or extinct hydrothermal vents at about 3,000 – 6,500 meters depth.^[23][24] The vents create sulfide deposits, which collect metals such as silver, gold, copper, manganese, cobalt, and zinc.^[9][25] The deposits are mined using hydraulic pumps or bucket systems.

The largest deposits occur in the Pacific Ocean between Mexico and Hawaii in the Clarion Clipperton Fracture Zone. It stretches over 4.5 million square kilometers of the Northern Pacific Ocean between Hawaii and Mexico.^[26] Scattered across the abyssal plain are trillions of polymetallic nodules, potato-sized rocklike deposits containing minerals such as magnesium, nickel, copper, zinc, and cobalt.^[26]

The Cook Islands contains the world’s fourth largest deposit in the South Penrhyn basin close to the Manihiki Plateau.^[27]

Polymetallic nodules are found within the Mid Atlantic Ridge system, around Papua New Guinea, Solomon Islands, Vanuatu, and Tonga,^[28]: 356 and the Peru Basin.^[29]

Cobalt-rich crusts are found on seamounts in the Atlantic and Indian Oceans, as well as countries such as the Pacific Federated States of Micronesia, Marshall Islands, and Kiribati.^[28]: 356

On November 10, 2020, the Chinese submersible Fendouzhe (Striver) reached the bottom of the Mariana Trench 10,909 meters (35,790 feet). Chief designer Ye Cong said the seabed was abundant with resources and a "treasure map" can be made.^[30]

Promising sulfide deposits (an average of 26 parts per million) were found in the Central and Eastern Manus Basin around PNG and the crater of Conical Seamount to the east. It offers relatively shallow water depth of 1050 m, along with a nearby gold refinery.^[25]

Deposit types

Seabed minerals include three main types: Polymetallic nodules, Polymetallic sulfide deposits, and Cobalt-rich crusts.^[28]: 356

Polymetallic nodules

 

Example of manganese nodule that can be found on the sea floor

Polymetallic or manganese nodules are found at depths of 4-6  km, largely on abyssal plains.^[31] Manganese and related hydroxides precipitate from ocean water or sediment-pore water around a nucleus, which may be a shark’s tooth or a quartz grain, forming potato-shaped nodules some 4–14 cm in diameter. They accrete at rates of 1–15 mm per million years. These nodules are rich in metals including rare earth elements, cobalt, nickel, copper, molybdenum, lithium, and yttrium.^[27]

Polymetallic nodules/manganese nodules are found on abyssal plains, in a range of sizes, some as large as 15 cm long. Nodules are reported to have average growth rates near 10–20 mm/Ma.^[32]

Polymetallic sulfides

Polymetallic or sulfide deposits form in active oceanic tectonic settings such as island arcs and back-arcs and mid ocean ridge environments.^[33] These deposits are associated with hydrothermal activity and hydrothermal vents at sea depths mostly between 1 and 4 km. These minerals are rich in copper, gold, lead, silver and others.^[28]: 356

Polymetallic sulphides appear on seafloor massive sulfide deposits. They appear on and within the seafloor when mineralized water discharges from a hydrothermal vent. The hot, mineral-rich water precipitates and condenses when it meets cold seawater.^[32] The stock area of the chimney structures of hydrothermal vents can be highly mineralized. The Clipperton Fracture Zone hosts the world's largest deposit nickel resource. These nodules sit on the seafloor and require no drilling or excavation.^[34] Nickel, cobalt, copper and manganese make up nearly 100% of the contents.^[34]

Cobalt-rich crusts

Cobalt-rich crusts (CRC’s) form on sediment-free rock surfaces around oceanic seamounts, ocean plateaus, and other elevated features.^[35] The deposits are found at depths of 600–7000 m and form ‘carpets’ of polymetallic rich layers about 30 cm thick at the feature surface. Crusts are rich in a range of metals including cobalt, tellurium, nickel, copper, platinum, zirconium, tungsten, and rare earth elements.^[28]: 356 Temperature, depth and seawater sources shape how the formations grow.

Cobalt-rich formations exist in two categories depending on the depositional environment:^[36]

• hydrogenetic cobalt-rich ferromanganese crusts grow at 1–5 mm/Ma, but offer higher concentrations of critical metals.
• hydrothermal crusts and encrustations precipitate quickly, near 1600–1800 mm/Ma and grow in hydrothermal fluids at approximately 200 °C

Submarine seamount provinces are linked to hotspots and seafloor spreading and vary in depth. They show characteristic distributions. In the Western Pacific, a study conducted at <1500 m to 3500 m bsl reported that cobalt crusts concentrate on less than 20° slopes. The high-grade cobalt crust in the Western Pacific correlated with latitude and longitude, a region within 150°E‐140°W and 30°S‐30°N^[37]

Deposit types and related depths^[24]

Type	Average Depth	Resources
Polymetallic nodule Manganese nodule	4,000 – 6,000 m	Nickel, copper, cobalt, and manganese
Manganese crusts	800 – 2,400 m	Mainly cobalt, some vanadium, molybdenum and platinum
Polymetallic sulfide deposits	1,400 – 3,700 m	Copper, lead and zinc some gold and silver

Diamonds are mined from the seabed by De Beers and others.

Projects

Hakurei

The world's first large-scale mining of hydrothermal vent mineral deposits was carried out by Japan Oil, Gas and Metals National Corporation (JOGMEC) from August - September, 2017,^[38] using the research vessel Hakurei,^[39] at the 'Izena hole/cauldron' vent field within the hydrothermally active back-arc Okinawa Trough, which contains 15 confirmed vent fields according to the InterRidge Vents Database.^[40]

Solwara 1

The Solwara 1 Project was the first time a legitimate legal contract and framework had been developed on deep sea mining.^[41] The project was based off the coast of Papua New Guinea (PNG), near New Ireland province. The project was a joint venture between Papua New Guinea and Nautilus Minerals Inc. Nautilus Minerals held a 70% stake and Papua New Guinea purchased a 30% stake in 2011.^[42] PNG's economy relies upon the mining industry, which produces around 30-35% of GDP.^[43] Nautilus Minerals is a Canadian deep-sea mining company .^[41] The project was approved in January 2011, by PNG's Minister for Mining, John Pundari.^[41] The company leased a portion of the seabed in the Bismarck Sea.^[44] The lease licensed access to 59 square kilometers. Nautilus was allowed to mine to a depth of 1,600 meters for a period of 20 years.^[44][43] The company then began the process of gathering the materials and raising money for the project.^[45] The intent was to mine a high grade copper-gold resource from a weakly active hydrothermal vent.^[46] The target was 1.3 tons of materials, consisting of 80,000 tons of high-grade copper and 150,000 to 200,000 ounces of gold sulfide ore, over 3 years.^[43] The project was to operate at 1600 mbsl^[46] using remotely operated underwater vehicles (ROV) technology developed by UK-based Soil Machine Dynamics.^[47]

Community and environmental activists^[10] launched the Deep Sea Mining Campaign^[48] and Alliance of Solwara Warriors, comprising 20 communities in the Bismarck and Solomon Seas who attempted to ban seabed mining. Their campaign against the Solwara 1 project lasted for 9 years. Their efforts led the Australian government to ban seabed mining in the Northern Territory.^[49] In June 2019, the Alliance of Solwara Warriors wrote the PNG government calling for them to cancel all deep sea mining licenses and ban seabed mining in national waters.^[49] They claimed that PNG had no need for seabed mining due to its abundant fisheries, productive agricultural lands, and marine life.^[49] They claimed that seabed mining benefited only a small number of already wealthy people, but not local communities and Indigenous populations.^[49] Others chose to engage in more artistic forms, such as Joy Enomoto.^[50] She created a series of woodcut prints titled Nautilus the Protector. The activist community argued that authorities had not adequately addressed free, prior and informed consent for affected communities and violated the precautionary principle.^[51]

In December 2017 the company had difficulties in raising money and eventually could no longer pay what it owed to the Chinese shipyard where the “production support vessel” was docked.^[42] Nautilus lost access to the ship and equipment.^[42] In August 2019, the company filed for bankruptcy, delisted from the Toronto Stock Exchange, and was liquidated.^[52] PNG lost over $120 million dollars.^[42] Nautilus was purchased by Deep Sea Mining Finance LTD. PNG has yet to cancel the extraction license contract.

Shell

In the 1970s Shell, Rio Tinto (Kennecott) and Sumitomo conducted pilot test work, recovering over ten thousand tons of nodules in the CCZ.^[53]

Licenses

Mining claims registered with the International Seabed Authority (ISA) are mostly located in the CCZ, most commonly in the manganese nodule province.^[24] As of 2019 the ISA had entered into 18 contracts with private companies and national governments in the CCZ.^[29]

Cook Islands

In 2019, the Cook Islands passed two deep sea mining laws. The Sea Bed Minerals (SBM) Act of 2019 was to enable "the effective and responsible management of the seabed minerals of the Cook Islands in a way that also...seeks to maximize the benefits of seabed minerals for present and future generations of Cook Islanders."^[54] The Sea Bed Minerals (Exploration) Regulations Act and the Sea Bed Minerals Amendment Act were enacted in 2020 and 2021, respectively.^[55] As much as 12 billion tons of polymetallic nodules are present in the Cook Islands EEZ.^[56]

The Mining Company

In 2023, a Canadian company, The Mining Company, partnered with a Micronesian island to start mining.^[57]

Extraction methods

Robotics and AI technologies are under development.^[58]

Remotely operated vehicles (ROVs) are used to collect mineral samples from prospective sites, using drills and other cutting tools. A mining ship or station collects the deposits for processing.^[47]

The continuous-line bucket system (CLB) is an older approach. It operates like a conveyor-belt, running from the bottom to the surface where a ship or mining platform extracts the minerals, and returns the tailings to the ocean.^[59]

Hydraulic suction mining instead lowers a pipe to the seafloor and pumps nodules up to the ship. Another pipe returns the tailings to the mining site.^[59]

Process

The three stages of deep-sea mining are prospecting, exploration and exploitation. Prospecting entails searching for minerals and estimating their size, shape and value. Exploration analyses the resources, testing potential recovery and potential economic/environmental extraction impacts. Exploitation is the recovery of these resources.^[60]

Resource assessment and pilot mining are part of exploration. If successful, “resources” attain a “reserves” classification.^[61] Bottom scanning and sampling use technologies such as echo-sounders, side scan sonars, deep-towed photography, remotely-operated vehicles, and autonomous underwater vehicles (AUV).

Extraction involves gathering material (mining), vertical transport, storing, offloading, transport, and metallurgical processing.

Polymetallic minerals require special treatment. Issues include spatial tailing discharges, sediment plumes, disturbance to the benthic environment, and analysis of regions affected by seafloor machines.^[61]

Environmental impacts

Deep sea mining (like all mining) must consider potential its environmental impacts. Deep sea mining has yet to receive a comprehensive evaluation of such impacts.

Environmental impacts include sediment plumes, disturbance of the bottom, and tailing disposition.^[9]

Technology is under development to mitigate these issues. This includes selective pick-up technology that leaves alone nodules that contain life and leaves behind some nodules to maintain the habitat.^[58]

Sediment plumes

Plumes are caused when mine tailings (usually fine particles) are returned to the ocean. Because the particles are fine (small and light), they can remain suspended in the water column for extended periods. Plumes can spread over large areas. Tailings increase water turbidity (cloudiness). Plumes form wherever the tailings are released, typically either near near the bottom plumes or at the surface.^[24][62]

Near-bottom plumes occur when the tailings are pumped back down to the mining site. Depending particle size and water currents, surface plumes can spread widely.^[24][59] In shallow water, sediment can resuspend following storms, starting another cycle of damage.

Benthic disturbance

Removing parts of the sea floor disturbs the habitat of benthic organisms.^[24]

Preliminary studies indicated that the seabed requires decades to recover from even minor disturbances.^[63]

Nodule fields provide hard substrate on the bottom, attracting macrofauna. A study of benthic communities in the CCZ assessed a 350 square mile area with an ROV. They reported that the area contained a diverse abyssal plain megafaunal community.^[64] Megafauna (species longer than 20 mm (0.79 in)) included glass sponges, anemones, eyeless fish, sea stars, psychropotes, amphipods, and isopods.^[64] Macrofauna (species longer than 0.5mm) were reported to have high species diversity, numbering 80 -100 per square meter. The highest species diversity was found among polymetallic nodules.^[64] In a follow-up survey in areas with potential for seabed mining, researchers identified over 1,000 species, 90% previously unknown, with over 50% dependent on polymetallic nodules for survival.^[64]

Noise and light pollution

Deep sea mining generates ambient noise in normally-quiet pelagic environments.

DSM sites are normally pitch dark. Mining efforts may increase light levels to illuminate the bottom.

Impacts

Polymetallic nodule fields are hotspots of abundance and diversity for abyssal fauna.^[65] Sediment can clog filter-feeding organisms such as manta rays.^[62] Because they block the sun, they inhibit growth of photosynthesizing organisms, including coral and phytoplankton. Phytoplankton sit at the bottom of the food chain. Reducing phytoplankton reduces food availability for all other organisms.^[24][66] Metals carried by plumes can accumulate in tissues of shellfish.^[67] This bioaccumulation works its way through the food web, impacting predators, including humans. Biomass loss stemming from deep sea mining was estimated to be significantly smaller than that from mining on land.^[68] One estimate of land ore mining reports that it will lead to a loss of 568 megatons of biomass (approximately the same as that of the entire human population)^[69] versus 42 megatons of biomass from DSM. In addition, land ore mining will lead to a loss of 47 trillion megafauna organisms, whereas deep-sea mining is expected to lead to a loss of 3 trillion. By contrast, a different study reported that deep sea mining would be approximately 25 times worse for biodiversity than land mining.^[70]

Noise affects deep sea fish species and marine mammals. Impacts include behavior changes, communication difficulties, and temporary and permanent hearing damage.^[71] Shrimp found at hydrothermal vents suffered permanent retinal damage when exposed to submersible floodlights.^[71] Behavioral changes include vertical migration patterns, ability to communicate, and ability to detect prey.^[72]

Laws and regulations

Deep-sea mining is not governed by a universal legal framework. Various norms and regulations have emerged both at an international level and within individual countries. The United Nations Convention on the Law of the Sea (UNCLOS) sets the overarching framework. The United States did not ratify the founding treaty.

International Seabed Authority

Activities in international waters are regulated by the International Seabed Authority (ISA). It was established in 1994. The United States is not a member of ISA. In 2021, China became the biggest contributor to ISA's administrative budget. Beijing also regularly donates to specific ISA funds. In 2020, China announced a joint training center with ISA in the Chinese port city of Qingdao.^[16] Continental shelves are subject to the jurisdictions of the adjoining states.

Regulations

The Area is governed by various treaties and regulations, based on the principles within UNCLOS (1982): outlined in Part XI and Annexes III and IV and found in the Implementation Agreement of 1994 and ISA regulations. ISA regulations are divided into three categories, for polymetallic nodules, polymetallic sulphides and cobalt-rich ferromanganese crusts. The Area is the ‘common heritage of all mankind’, which means that its natural resources can be prospected, explored and exploited only in accordance with international regulations and that profits from these materials must be shared.

There are three stages of activities regarding deep-sea mining: prospecting, exploration and exploitation. Prospecting entails searching for minerals and estimating their size, shape and value, this does not require approval from the ISA and can be done by notifying the approximate area and a formal written condition of compliance with UNCLOS and ISA regulations. Exploration, which implies exclusive rights to look for mineral deposits in a specific zone analyses the resources, testing potential recovery and potential economic/environmental impacts of their extraction, this phase requires ISA approval. In the case of exploitation, which means the recovery of these resources for commercial uses, both states and private entities need an approved contract from the ISA, which is evaluated by its Legal and Technical Commission (LTC).^[60] Based on the LTC’s evaluation the ISA Council will approve or reject the application. In the case of approval the contract creates an exclusive right to prospect, explore and exploit resources. Exploration contracts can last up to 15 years, extendable thereafter for periods up to 5 years^[73] and the zones covered are large: 150.000 km2 (polymetallic nodules), 10.000 km2 (polymetallic sulphides) and 3.000 km2 (cobalt-rich ferromanganese crusts).

While the Area is primarily regulated by international law national regulations do play a role, as non-state actors who wish to submit an application to prospect, explore and exploit the deep-seabed must be backed by a sponsoring state which is held responsible and guarantees that the non-state actor abides by the ISA's contract and UNCLOS regulations. Sponsorship is defined by national law, which stipulates conditions, procedures, measures, fees and sanctions for non-state actor involvement.

Continental Shelves are delineated at 200 nautical-miles from the coast but can be extended up to 350 nautical-miles. The continental shelf falls under coastal state jurisdiction, which has sovereign rights over natural resources within its delineated zone. This means that no other state or non-state actor can prospect/explore/exploit resources in a continental shelf without the consent of the coastal state. If a coastal state allows deep-sea mining activities within its' own continental shelf it is done through the attribution of licenses with conditions and procedures defined within state legislation.

International law influences state legislation within continental shelves as all states are obliged to protect and preserve the marine environment. All states must evaluate the ecological effects of deep-sea mining within their national jurisdiction as it could cause significant levels of pollution. States must also ensure that deep-sea mining activities do not damage other states' environment and pollution cannot spread beyond the one state's jurisdiction. A contractor must also make mandatory contributions to the ISA for mineral exploitation on an extended continental shelf as this extension impacts the ‘common heritage of mankind’ as it cute into what was previously the Area.

A DSM moratorium was adopted at the Global biodiversity summit in 2021.^[74] At the 2023 ISA meeting a DSM moratorium was enacted.^[57]

The United States did not ratify UNCLOS. Instead, it is governed by the Deep Seabed Hard Mineral Resources Act, which was originally enacted in 1980.^[75]

New Zealand's Foreshore and Seabed Act was enacted in 2004 and then repealed following Māori objections, who protested the Act as a "sea grab". The Act was replaced with the 2011 Marine and Coastal Area Bill.^[76][50]

Fauna and Flora International and World Wide Fund for Nature, broadcaster David Attenborough, and companies such as BMW, Google, Volvo Cars, and Samsung called for a moratorium.^[77][78]

History

See also: § Deep sea mining efforts, and § Laws and regulations

In the 1960s, the prospect of deep-sea mining was assessed in J. L. Mero's Mineral Resources of the Sea.^[25] Nations including France, Germany and the United States dispatched research vessels in search of deposits. Initial estimates of DSM viability were exaggerated. Depressed metal prices led to the near abandonment of nodule mining by 1982. From the 1960s to 1984 an estimated US $650 million was spent on the venture, with little to no return.^[25]

A 2018 article argued that "the 'new global gold rush' of deep sea mining shares many features with past resource scrambles – including a general disregard for environmental and social impacts, and the marginalisation of indigenous peoples and their rights".^[79][80]

2000s

In 2001, China Ocean Mineral Resources Research and Development Association (COMRA), received China’s first exploration license.^[16]

2020s

This section is an excerpt from Timeline of sustainable energy research 2020–present § Seabed mining.[edit]

2020

• Researchers assess to what extent international law and existing policy support the practice of a proactive knowledge management system that enables systematic addressing of uncertainties about the environmental effects of seabed mining via regulations that, for example, enable the International Seabed Authority to actively engage in generating and synthesizing information.^[81]

2021

• A moratorium on deep-sea mining until rigorous and transparent impact assessments are carried out is enacted at the 2021 world congress of the International Union for the Conservation of Nature (IUCN). However, the effectiveness of the moratorium may be questionable as no enforcement mechanisms have been set up, planned or specified.^[82] Researchers have outlined why there is a need to avoid mining the deep sea.^{[83][84][85][86][87]}
• Nauru requested the ISA to finalize rules so that The Metals Company be approved to begin work in 2023.^[88]
• China’s COMRA tested its polymetallic nodules collection system at 4,200 feet of depth in the East and South China Seas. The Dayang Yihao was exploring the Clarion-Clipperton Zone for China Minmetals when it crossed into the U.S. exclusive economic zone near Hawaii, where for five days it looped south of Honolulu without having requested entry into US waters.^[89]

2022

• Impossible Metals announces its first underwater robotic vehicle, 'Eureka 1', has completed its first trial of selectively harvesting polymetallic nodule rocks from the seabed to help address the rising global need for metals for renewable energy system components, mainly batteries.^{[90][91][92][93]}

2023

• Supporters of mining were led by Norway, Mexico, and the United Kingdom, and supported by The Metals Company.^[88]
• Chinese prospecting ship Dayang Hao prospected in China-licensed areas in the Clarion Clipperton Zone.^[89]

2024

• Norway approved commercial deep-sea mining. 80% of Parliament voted to approve.^[94]

Protests

In December 2023, exploration vessel The Coco was disrupted by Greenpeace activists seeking to block the collection of data to support a mining permit.^[95] Obstructing canoes and dinghies were countered by water hoses. The mining ship is owned by Canadian-based The Metals Company.^[95]

See also

•  Oceans portal

• Blue economy – Economy based on exploitation and preservation of the marine environment
• Blue justice
• International Seabed Authority – Intergovernmental body to regulate mineral-related activities on the seabed
• Deepwater drilling – Using a drilling rig to bore holes for petroleum extraction in deep sea, the process of creating holes for oil mining in deep sea.
• Manganese Nodules – Mineral concretion on the sea bottom made of concentric layers of iron/manganese hydroxides, concretions of manganese and other minerals formed over thousands of years on the abyssal plains; sought after for deep sea mining projects.
• Clipperton Fracture Zone – Fracture zone of the Pacific Ocean seabedPages displaying short descriptions of redirect targets, location of interest for deep sea mining
• Human impact on marine life
• Ocean colonization – Type of ocean claim
• Ocean development – Establishing of human activities at sea and use of the ocean
• Deepsea mining in Namibia

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External links

• The Deep Sea Mining Summit 2023 "The international forum for deep sea mining professionals"
• "Who Will Claim Common Heritage?–Corporate interests endanger international agreement on deep seabed minerals" in Multinational Monitor
• Deep Sea Mining – 8 min video on Australian science TV, June 2011
• – November 2014 Ocean News & Technology magazine
• . 3 January 2012. Archived from the original on 8 December 2015. Retrieved 2 March 2023.
• "Why are countries laying claim to the deep-sea floor?" - BBC article 21 June 2017
• Verichev, Stanislav; Drobadenko, Valery; Malukhin, Nikolay; Vilmis, Alexandr; Lucieer, Pieter; Heeren, John; Van Doesburg, Bob (2012). "Assessment of Different Technologies for Vertical Hydraulic Transport in Deep Sea Mining Applications". Volume 3: Pipeline and Riser Technology. pp. 137–144. doi:10.1115/OMAE2012-83156. ISBN 978-0-7918-4490-8.
• Mining the Deep Sea