I have known several commercial divers here in Louisiana over the years (I have never wanted to do that sort of thing myself), most of the jobs are dirty, and often dangerous, although there are a few I know that have found some jobs that sound almost pleasant. (inspection diving inside municipal water supplies, etc). As an example I have a very good friend that worked as a commercial diver in the late 80's/early 90's, back then the attitude of "divers are disposable" was still very much in force, safety even in the bigger operations was far short of what it should have been. It was one of these major lapses in safety that made him decide to find another line of work, he and one other diver were doing an inspection dive with surface supplied air, they started feeling light headed at depth and bolted for the surface, pased out on the way up, he woke up several hours later in a decompression chamber in New Orleans, (it turns out a new dive tender had cleaned their air hoses with bleach). Thankfully the other diver in the water was able to get them both to the surface before being overcome by the fumes.