GR translation: Alarms

[Mike Jing]

V606.33-37, P617.19-23   Voices in the steam. Alarms, many feet clopping in
shower shoes, silhouettes moving by, a gray cloudy evacuation. “What in
thee hell,” Major Marvy about to come, rising on his elbows distracted,
squinting in several directions, rapidly getting a softoff.
       “Raid,” a voice going past. “MPs,” shivers somebody else.

What does "Alarms" mean here?