Talk:Survival/@comment-181.73.46.197-20130915024611

When the oxygen levels reach zero and you haven't reached the exit, the clock stops running, and you don't lose (yet); it starts to drain your health and shields just like a hull breach (but faster), and just like Nightmare's "Vampire Mode", you don't die because of the drain, but your shields remain at zero and your HP remains at 1% 'till you reach the exit, or die from an enemy attack (or trap). As long as at least 1 teammate manages to reach the exit and to not die until the extraction clock reaches zero, you pass the mission.