It is a bit of a dump, but bloody cold as well, knew someone who used to be on subs for a few years in the 80's, always though it odd as he couldn't swim or so he said, but as he said if you are on the ocean floor it is not going to help!!
I have absolute respect for all the armed forces, think the country owes them a big debt, respect to you for being a submariner.
tabetha