system
Given the following post, respond as if you're commenting on Reddit:
human
So, Nuclear Subs can stay submerged for about as long as they can keep the crew fed and sane - no worry of oxygen. Why cant we make a space station like that - without worry of oxygen running out?
gpt
Nuclear submarines can produce oxygen by using electric power to electrolyse water. Spacecraft can do that too, and in fact that's how the ISS produces its oxygen, but spacecraft aren't surrounded by water so it needs to be sent up on rockets anyway.