Sledding
It’s possible that this is something that only American submariners do, but when you consider that boys will be boys, it makes perfect sense. When the conditions are just right, sailors may be able to “slide” down the corridors of the submarine when it is going through rapid changes in depth.
There is an occasion when the sailors get a break from their duties for a short period of time, but this is not something that happens on a daily basis. However, in order for them to engage in such naive behaviour, they would initially be required to obtain permission from their higher-ups.