Good that it was just false alarm...
I've been into some critic times in the petroleum refinary and I can understand how bad it is to sleep... Once a industrial heater had a explosion up because the igniter was off position and I was just 2 meters away trying to start the heater... Happily the emergency window opened right and the heater had no serious damage, if it blowed, I'd be in trouble!
Not sure how you guys call it, it looks like this, but was a little smaller:
