However, if the pack's three pounds of fuel runs out, if another astronaut doesn't quickly grab you, or if the air lock is irreparably damaged, you're in big trouble. No protocols can save you now. (In fact, there aren't any.) At the moment, there's no spacecraft to pick you up. The only one with a rescue-ready air-locked compartment—the Space Shuttle—is in retirement. So your only choice is to orbit, waiting for your roughly 7.5 hours of breathable air to run out. It wouldn't be too terrible. You might get a little hungry, but there's up to a liter of water available via straw in your helmet. You'd simply sip and think of your family as you watched the sun rise and set—approximately five times, depending on your altitude.