I am 100 m underground at the ATLAS cavern below Point1 at CERN. I take a walk away from the detector, passing the iris scanner (not yet ready, http://bulletin.cern.ch/eng/articles.php?bullno=35/2006&base=art) and then turning to the elevator.
In case of fire or gas leaks the elevator is the place to go to, because it is over pressurized.
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