Diver.

Deep sea diving or commercial diving involves any manmade underwater equipment. Commercial divers work on ships, bridges, dams, critical pipeline systems, offshore oilfield sites, and search and recovery projects. Commercial divers may dive anywhere where there is water. Commercial diving is not something that you just go out and do. There has to be a lot of hands-on time, things you can't learn from a book. Diving involves science and nuclear technology. Every dive is unique, exciting, and adventurous.