Care that is Preventative
Maintaining a submarine at the same high level as one would any other technologically advanced machine is necessary to ensure that it can continue to function properly while at sea. Maintaining, repairing, and repairing all of the ship’s ports and hatches takes a significant amount of time from the sailors, both during the day and during the night.
This, of course, encompasses the process of maintaining the launch tubes as well as the electronic equipment. This maintenance is eating up the vacation time that the sailors have saved up. It would appear that even when they are not on duty, sailors are given a brief period of respite.