This is the best summary I could come up with:

“I first saw this in 2013 - an enormous amount of oxygen being produced at the seafloor in complete darkness,” explains lead researcher Prof Andrew Sweetman from the Scottish Association for Marine Science.

And because these nodules contain metals like lithium, cobalt and copper - all of which are needed to make batteries - many mining companies are developing technology to collect them and bring them to the surface.

And his discovery, published in the journal Nature Geoscience, raises new concerns about the risks of proposed deep-sea mining ventures.

The scientists worked out that the metal nodules are able to make oxygen precisely because they act like batteries.“If you put a battery into seawater, it starts fizzing,” explained Prof Sweetman.

And this discovery suggests that the nodules themselves could be providing the oxygen to support life there.Prof Murray Roberts, a marine biologist from the Univerisity of Edinburgh is one of the scientists who signed the seabed mining petition.

“There’s already overwhelming evidence that strip mining deep-sea nodule fields will destroy ecosystems we barely understand,” he told BBC News.“Because these fields cover such huge areas of our planet it would be crazy to press ahead with deep-sea mining knowing they may be a significant source of oxygen production.”Prof Sweetman added: “I don’t see this study as something that will put an end to mining.“[But] we need to explore it in greater detail and we need to use this information and the data we gather in future if we are going to go into the deep ocean and mine it in the most environmentally friendly way possible.”

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That’s mind blowing.