No Slamming Doors
Given that sailors need all the sleep they can get, and it’s hard to sleep on a submarine. To begin with, slamming doors is not allowed. Since every little noise may cause people to wake up, this rule must be followed to avoid waking someone else up.
There’s also another side to it. It’s sometimes essential to keep the total in order to avoid being detected by enemy ships via sonar. As a result, slamming doors or making other loud noises is not permitted.