Scientists have uncovered a perplexing phenomenon in the ocean’s depths: metallic nodules on the seafloor appear to generate oxygen without sunlight. These potato-sized lumps, rich in manganese, nickel, and cobalt, have intrigued researchers since their discovery was detailed in Nature Geoscience last July.

Using benthic chambers to measure oxygen levels, researchers observed unexpected oxygen accumulation in areas abundant with these nodules. This finding challenges traditional assumptions about oxygen production, typically associated with photosynthesis.

The implications extend beyond scientific curiosity. These nodules are also the focus of deep-sea mining interests, as they contain valuable metals essential for technologies like electric vehicle batteries. The discovery of oxygen production raises concerns about the potential environmental impact of mining these areas, highlighting the need for careful consideration before exploiting these resources.