Well sounds like fun if still in your youth. Recently did a normal SCUBA dive after being out of it for years and remembered how tiring it was just to put on the dang equipment here in decent water temp. Can't imagine doing COLD water dives.
I did basic and advanced diving but then got busy with other stuff and quit doing it.
Hopefully you have an extreme love of this sort of thing and not just wanting to do it cause someone said you'd make good money at it. Can easily get hurt with that sort of stuff. Buddy of mine did industrial under water recovery all over the World and got hurt a few times before he got out of it and started to a bit safer job like the rest of us.