I have a small group of astronauts in a damaged vessel, adrift for days with a non-functional environmental system/scrubbers. Ambient oxygen levels are low, but they have some emergency tanks of compressed air (say several hours' worth) around the cabin/from their spacesuits.
- How long, and at what oxygen levels, could they conceivably survive before rescue without severe brain damage setting in from prolonged hypoxia
- What steps would they take to try and extend their survival while awaiting rescue
- What would they experience during that time (ie. if they're blacking out and experiencing muscle weakness, is it realistic that they experience that over the course of days?)
I assume they'd try to seal any leaks and keep physical activity to an absolute minimum until rescue. Ideally for, plot reasons, I'd like them to stay alive and adrift for several days but I'm not sure how much I'm stretching what's feasible without serious medical repercussions. (I will say - it's fine if some of the crew get injured, but I do need at least one person to walk out of this experience only emotionally scathed)
Edit - Based on Comments:
In order for the 4 crew members to survive up to 3 days, what is the minimum volume of Air/Oxygen that my crew need to survive but it also be a dire situation with a very real possibility of Death.