An alarm immediately begins to sound. However, there are currently no employees in sight in the hallway revealed by the newly-broken door, so they can probably get a little bit of hasty snooping in before anyone makes it down to them.

There are three doors on each side of the hallway. Each has a small window, but none are lit and the hallway lights are dimmed to save power until employees arrive, so it's almost impossible to make out what's inside each room.

What do they do from there?