The oxygen concentration is actually quite a bit higher in most hadal zones (> 150 µmol/kg [1]) than oxygen minimum zones that exist in the middle layers (< 45

The oxygen concentration is actually quite a bit higher in most hadal zones (> 150 µmol/kg [1]) than oxygen minimum zones that exist in the middle layers (< 45 µmol/kg [2]). It's definitely not a hypoxic environment relative to the rest of the ocean. [1] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5829614/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5829614/ [2] https://web.stanford.edu/group/MicheliLab/pdf/oceanographicandbiologicaleffectsofshoaling.pdf https://web.stanford.edu/group/MicheliLab/pdf/oceanographica...