Commercial diving is more of a calling than a job.
The big myth is that you are getting paid to dive.
Nobody ever paid me to dive!
They paid me to find, recover, dig, cover, dredge, inspect, clean, repair, install, remove, replace, diving was the way to get to the job site.
Today more and more work is being done by ROVs. Even a commercial diver would do well to get trained and qualified as a ROV pilot. Pilots work in nicer conditions and have longer working lifetimes than divers. Sometimes the ROV pilots will spend all night repairing the ROV and then all the next day flying it again.
In any case, the more skills you bring to the table in the begining the better. If you are a weldor who can pipefit and repair hydraulic systems then you have a leg up, throw in some electronics and your are even better.