Read my post, I said you can work for yourself, by yourself. It doesn't take a Kirby Morgan helmet, surface supplied air, a huge barge with crew, and lots of gear to clean hulls. Don't over complicate it. I can clean the hull of a 100 ft boat by myself in a few hours.That's doing it by hand. If you're gonna clean tankers of freighters, your gonna need some help, and a hydraulic cleaning machine. What is the origional poster cleaning? Sailboats at the local marina or big ships? Depends on what you wanna do. But, there is NO law that says that if you wanna go diving that you have to be certified. The only law would apply is the Hydrostatic test date on your air cylinders. That law only applies if the cylinders are used in "interstate commerce". With all that being said.....someone would be a real dumbass to go diving without training. We may be compairing apples to oranges........in that case we are probably both right.