"What happened?"
"What's going on?"
"What's happening?"
People gave a start upon hearing the alarm, and then panic grew and spread. They were in a secret, special experimental base after all. They could all die there!
Also…
Many automatically ran toward the exit when they heard the alarm. However, the doors at the exits soon closed loudly one after another, and then the doors of each experimental zone shut as well, locking in the ones who didn't manage to get out.
"No!"
"No…"
Watching the doors close, all who failed to get out burst in despairing screams. They threw themselves onto the doors and pushed the opening buttons as hard as they could. However, those metal doors remained closed without moving even an inch.