Tiny animals found living inside deep-sea nodules as US weighs first commercial mining permit

Researchers have found that polymetallic nodules on the deep seabed host unique communities of small marine animals, including crustaceans such as Munidopsis species, living both on and inside the nodules themselves. The discovery comes from the Clarion-Clipperton Fracture Zone (CCZ) in the Pacific Ocean, a region targeted for deep-sea mining because the nodules contain valuable metals like nickel, cobalt, and manganese. Scientists describe the nodules as a "microcosm of life not seen anywhere else on the seafloor," suggesting they provide a distinct habitat that could be destroyed by mining operations.

The findings emerge as the United States weighs issuing its first commercial permit for deep-sea mining in the CCZ. The potential permit would allow a company to harvest nodules from the seabed, raising concerns among researchers about the impact on these newly documented ecosystems. The nodules form over millions of years and cannot be replaced on human timescales, meaning any habitat they provide would be permanently lost if the nodules are removed.

Studies indicate that the animals found inside the nodules include species not observed in surrounding sediments, implying the nodules serve as a specialized refuge. The research highlights a direct conflict between the push for critical minerals needed for green technologies and the preservation of deep-sea biodiversity that scientists are only beginning to understand.