A version of this story was originally published by the Pulitzer Center, which supported Elizabeth Claire Alberts as an Ocean Reporting Network fellow. We didn’t set out to investigate China’s deep-sea mining fleet, but as our research into the burgeoning industry developed over our yearlong partnership, it became clear that an investigation into the fleet’s alleged military dual use was emerging as an important, untold story. Shortly after we embarked on our joint project, geopolitics around the deep-sea mining landscape began to shift dramatically. In February 2025, China signed an agreement with the Cook Islands government to collaborate on deep-sea mining research and exploration. At the same time, it was pursuing a similar deal with the archipelago nation of Kiribati, marking a notable expansion of Chinese influence in the Pacific. China holds the largest number of exploration contracts issued by the International Seabed Authority (ISA), the U.N.-affiliated deep-sea mining regulator, and is also its biggest financial contributor. It also operates the world’s largest oceanographic research fleet. Against this backdrop, we kept returning to a central question: was China’s pursuit of deep-sea mining driven solely for accessing mineral resources, or was it also shaped by broader geopolitical strategy? Through extensive reporting, we learned that China’s interest in seabed mining was motivated by both of these things, and that some of its vessels were engaged in both deep-sea mining work and militarily strategic surveillance. Meanwhile, deep-sea mining efforts have been gathering pace in the United States. In March 2025, The Metals Company,…This article was originally published on Mongabay

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