Major goof **SPOILERS
When the crew realise they don't have enough oxygen to last until the rescue craft arrives, Pruett opens the hatch! Ridiculous! In so doing he de-pressurises the cabin and wastes a vast quantity of oxygen. If he wants to sacrifice himself he should have just committed suicide in the cabin. We know they only had a small amount of oxygen left in their suit life support systems (10 man minutes) so why does he choose to vent all the cabin oxygen out into space by opening the hatch? Crazy! This would leave the other two with only their suit oxygen.
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My God, it's full of stars!