Guess what happened to me.
I stroll along on full hp, passed the 1st sector easily, on normal mode. Suddenly, on the 2nd sector, I encounter a mantis ship with a teleporter. Of course, I expected mantises to come, but not 5 @$!#ING MANTISES. OH COME ON. Apparently, no one was on the ship, as no one repaired anything. I destroyed their ship, and the mantises destroyed my crew. Also, oxygen helped. Doors broken, and all open. Open to the death of my ship.