Deep Dive: Deep Sea Mining Robots — The Difficult Path from Lab to Commercialization

On January 2, 2028, Canadian deep-sea mining company DeepGreen Metals announced that its mining robot "Sea Dragon" completed commercial trial mining in the Pacific Ocean's Clarion-Clipperton Zone (CCZ). During a single 72-hour dive operation, Sea Dragon collected approximately 12 tonnes of polymetallic nodules containing nickel, cobalt, and manganese—key battery metals.

Sea Dragon is a tracked deep-sea mining robot weighing approximately 28 tonnes, designed for operation at depths of 4,000 to 6,000 meters. Its base is equipped with vacuum suction and vibration screening systems that can sort polymetallic nodules measuring 2 to 15 centimeters from seafloor sediment and transport them to the surface vessel via pipeline.

DeepGreen CEO Gerard Barron stated that the CCZ's polymetallic nodules contain abundant nickel and cobalt—critical raw materials for EV batteries. "Estimates suggest the cobalt contained in CCZ polymetallic nodules alone exceeds six times the known terrestrial reserves."

However, deep-sea mining faces serious environmental controversy. In December 2027, over 600 marine scientists signed an open letter calling for a moratorium on deep-sea mining activities. "We understand less than 5% of deep-sea ecosystems. Conducting large-scale mining in such ignorance is irresponsible," said senior scientist Sylvia Earle at the Marine Conservation Institute.

Environmental concerns center on several issues: seafloor sediment disturbance may affect ocean carbon sinks; mining noise may disrupt deep-sea organisms; wastewater discharge may alter seawater chemistry. Greenpeace has designated deep-sea mining a priority protest target for 2028.

The International Seabed Authority (ISA) failed to reach consensus on deep-sea mining regulations at its November 2027 meeting. Some nations (including China, Russia, and South Korea) support commercial mining advancement, while France, Germany, and Spain call for a moratorium. The ISA plans a special session in July 2028.

DeepGreen's trial data will be submitted to the ISA for environmental impact assessment. The company plans to begin small-scale commercial mining in 2029 with an annual target of 10,000 tonnes of polymetallic nodules.