A research study in Japan has shown that even a brief two-hour deep-sea Mining test can have long-lasting consequences on Marine Ecosystems. The study focused on Japan's first successful test in 2020 to extract cobalt crusts from the ocean floor, which resulted in a significant decrease in fish and shrimp populations in the surrounding area even after a year. The study also found that the mining test created a plume of sediment that spread through the surrounding water, impacting ocean animals and potentially contaminating fish food sources. Experts highlight the need for further study and regulation before deep-sea mining operations begin on a larger scale.

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