However, the Stars and Stripes reports that according to a local constabulary spokesman, a British harbor pilot was still on board the submarine at the time of the accident. If the crew still had the pilot onboard, it does make sense that they'd need a party topside to help transfer the pilot off to the pilot boat. In fact, that's just about the only reason I can think of to have anybody topside at all.
One of the two sailors who died was the Chief of the Boat - the senior enlisted man in the crew, equivalent to a command sergeant major in other services. Had I stayed in the service - and had I stayed enlisted - that's probably the job that I'd have had right about now. Somber-making thought, that is...