The discovery that lumps of metal on the seafloor produce oxygen raises questions over plans to mine the deep ocean.

Scientists have discovered “dark oxygen” being produced in the deep ocean, apparently by lumps of metal on the seafloor.

About half the oxygen we breathe comes from the ocean. But, before this discovery, it was understood that it was made by marine plants photosynthesising - something that requires sunlight.

Here, at depths of 5km, where no sunlight can penetrate, the oxygen appears to be produced by naturally occurring metallic “nodules” which split seawater - H2O - into hydrogen and oxygen.

Several mining companies have plans to collect these nodules, which marine scientists fear could disrupt the newly discovered process - and damage any marine life that depends on the oxygen they make.

  • @VeratEnglish
    2•2 months ago

    The metals are forming a Galvanic cell with the salt water as an electrolyte, the section of the linked article labeled Galvanic corrosion mentions the splitting off of hydrogen in salt water. There is no membrane so electricity just goes through the conductive salt water. The exact voltage depends on which two metals were involved, this page has a table of the voltages in sea water (in mV)