Before revision: Reduced oxygen content Studies have shown that the nodules are important for the production of "dark oxygen", oxygen produced without light, which provide the seafloor in the deep ocean with much of its oxygen.Discovery of 'dark oxygen' from deep-sea metal lumps could trigger rethink of origins of life Mitigation of environmental impacts There is still a gap in research of how to reduce these environmental impacts.
After revision: Reduced oxygen content Studies have shown that the nodules are a source of "dark oxygen", oxygen produced without light, which provides the seafloor in the deep ocean with much of its oxygen.Discovery of 'dark oxygen' from deep-sea metal lumps could trigger rethink of origins of life Mitigation of environmental impacts There is still a gap in research of how to reduce these environmental impacts.