Sounds like an awesome job! Submarines fascinate me. Once, when I was in Barbados, got to take a tour in a sub, all crewed by ex-US servicemen, including the master diver who was in a boat ready to dive down and get us if anything went wrong.
Although the sub was capable I think of getting to 400-600 ft deep, it only went to 140 feet, the limit that the diver could go. The sub could be remotely operated from the bridge on the outside of the sub.
Either way, sounds like your job is also a great adventure!