In the interest of space pirating, I suggest astronauts can go unconscious upon total health reaching zero where they go into a "overheating" like condition, where upon their inventory can be accessed and their body can be dragged around by other astronauts. If healed to at least one hitpoint, they will regain consciousness when the timer runs out, and if healed to full, they regain consciousness immediately, should they remain at zero health they respawn when timer runs out.