Did you walk into Level 4 or Level 2? Those are the two floors that have sustained damage. Level 4 has a gas leak, and Level 2 has a power outage, so is nearly completely dark. These are the maintenance issues that the note in your inventory says you'll need to fix. If it was Level 4, then there should have been a dirty brown gas filling the hallway. If it was Level 2, then it would have been much darker. On level 2, you can only walk back into the elevator. If you try walking anywhere else, you'll trip over and die. I was really rushing to finish at the point that I added these death scenarios, so didn't put much time into explaining exactly what happened. The character says something like "Ahhh!! I tripped over" then he falls over and dies (maybe due to a broken neck, but that isn't obvious). On Level 4, you die immediately as a result of inhaling the poisonous gas. I think the character says something like "Ahhh!! The gas is killing me", after which he falls over and dies. There is a puzzle in the game that lets you walk around this Level with a breathing mask, but if you go down to Level 4 without it, then you'll die. It is also possible to walk around Level 2 if you've restored power to that level, and its possible to walk around Level 4 without wearing the breathing mask if you've vented the gas already.