How did they survive the way back?
In order to slow down the ship in The Martian (or bring it closer to the MAV, I don't recall), the crew of the Hermes vent the entire ship – save for the cockpit – in the void. Then they rescue him.
Then... what? Even assuming they could seal the docking door again (side question: why did they have to blow it up, couldn't they just open it normally?), they don't have any air left. How did they survive the lengthy trip back in an oxygen-less ship? Did they all stay in the cockpit the entire time?
Best Answer
Then... what? Even assuming they could seal the docking door again
It was an airlock door. Airlocks have two doors. They opened one and breached the other. The one that was just opened can simply be closed. The airlock will just not be functional afterwards.
(side question: why did they have to blow it up, couldn't they just open it normally?),
Because airlocks are constructed to prevent both doors from being opened simultaneously under any circumstances. So that the ship isn't vented accidentally. You cannot override the safeguards easily or quickly.
they don't have any air left. How did they survive the lengthy trip back in an oxygen-less ship? Did they all stay in the cockpit the entire time?
From the book:
Once Beck and I got to his quarters, we waited for the ship to repressurize. Hermes had enough spare air to refill the ship two more times if needed. It'd be a pretty shitty long-range ship if it couldn't recover from a decompression.
Pictures about "How did they survive the way back?"
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