When I was an intern, I worked in IT for a Fortune 500 company. They'd recently decommissioned their old tape loaders for the mainframe and had moved to an auto

When I was an intern, I worked in IT for a Fortune 500 company. They'd recently decommissioned their old tape loaders for the mainframe and had moved to an automated tape silo, so no longer had need for the tape room. They converted the tape room that was connected into a conference room, but they didn't disconnect the HALON. Although, smoking wasn't allowed in the facility anyway (this was early 2000s), they always made a point to remind us visitors (the data center was a several hour drive from corporate) to not smoke, and if the alarm went off, you had about 10 seconds to exit the room before the door automatically shut, with no way to exit from the inside and all oxygen would be evacuated from the room, and you would die a horrible, horrible death. I always tried to get a seat as close to the door as possible.