The 688 and 688i class fast attack submarines are very cramped. The Virgina Class subs are slightly more spacious and the Ohio Class GN/BN subs are very spacious. When I was on the USS Georgia/Florida I had a whole rack to myself with another one next to me to store all my essentials in. I've ridden on the latter 2 with female officers and from what I could tell they fit in just fine.