Caltech study confirms oxygen in water on Mars. On Nature Geoscience a new study highlights the solubility of O2 in brines under Martian near-surface conditions. Higher concetrations of O2
are foreseen in polar regions. The study suggest that there can be near-surface environments on Mars with sufficient O2 available for aerobic microbes to breathe.
a view of radar Marsis discovery of water under surface of Mars.