Don't Accidentally Poison Yourself!
Living in a bunker to escape disasters could still end up with accidental death if you don't have proper ventilation installed (especially during a nuclear war). We still have to breathe but that means carbon monoxide could become dangerously high within a confined, unventilated space. One simple action that could save your life, would be fitting a battery operated carbon monoxide alarm. At least then you could become aware of the dangers before they become potentially fatal. The alarm would also detect carbon monoxide from gas cooking appliances, thus warning you of any danger and allowing you to find a solution.