Sub-zero kills the human intestinal bacteria the Martian was using to fertilize and colonize the martian sand he planted the potato eyes in.
There was a few guys that did some scientific tests using vacuum chambers on Youtube and found out that yes there was a chance in certain cases.But then we won’t be sending actors into space with an agenda for dramatic content.
And i meant whst i said, its a one way trip considered until advanced travel times evolve.Who knows, we might have FTL speeds within 20 years.