While colonization of the martian subsurface by microorganisms throughout the pre-Noachian to Noachian epochs was a possibility, the subsurface may still probably host microorganisms right now (Des Marais, 2010 ; Ehlmann et al., 2011 ; Michalski et al., 2013 ; Cockell, 2014 ). On Earth, viable subsurface microorganisms utilizing chemotrophic metabolisms can happen at nice depths (as much as 5300 m) within the terrestrial subsurface (Szewzyk et al., 1994 ; Chivian et al., 2008 ) and up to 1922 m below the seafloor inside 35 million-yr-old marine sediments
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