Deep-seafloor organisms consume oxygen, which can be measured by in situ benthic chamber experiments.

The writers of the article “Evidence of dark oxygen production at the abyssal seafloor” report such experiments at the polymetallic nodule-covered abyssal seafloor in the Pacific Ocean in which oxygen increased over two days to more than three times the background concentration, which from ex situ incubations we attribute to the polymetallic nodules. Given high voltage potentials (up to 0.95 V) on nodule surfaces, the writers hypothesize that seawater electrolysis may contribute to this dark oxygen production.

Agenda – Dwellers in the Deep: Biological Consequences of Dark Oxygen – publication

Agenda – 29th Session of the International Seabed Authority Part II (TV ISA Web TV)

Stop diepzeemijnbouw voor het begint / Stop diepzeemijnbouw : Noorwegen, zeg NEE tegen diepzeemijnbouw! – petities