| Hi liquidjim!
I'm a commercial diver in America, so I'll give you the answers that I know.
1) American wet-welders usually don't do *just* wet-welding, they cover a wide range of sub-sea tasks, from construction to burning/cutting, to ditch digging. A US diver (working in the Gulf of Mexico) will make in the 80-120k range, depending on how often you get called out to work, and how long you stay offshore.
2) When working in the offshore (oceans) versus inshore (lakes, rivers, dams, water tanks), you earn 84 hours per week minimum, plus depth pay that averages about $1.50 per foot, with 44 hours being at the overtime rate of 150%. When working inland, you don't get near as many hours, but you can be at home a lot more often. Inland companies usually don't offer depth pay, but if you penetrate (say a pipeline, or a conductor under a dam) they offer penetration pay.
3) Working abroad is up to you, but there are certification issues. Google IMCA.
4) Bonuses? hmpf. The work is hard and thankless, the days and nights long, but the money can be good. Most American companies offer a superb benefit package as well (insurance, 401k, etc.)
5) Saturation diving is only done by the best of the best, don't look to get into Sat unless you have 5 or more years of experience. Sat pay is usually at a 24 hour rate, with 16 of those hours at overtime.
You can check out longstreath.com, offshorediver.com, they both have populated forums.
Good Luck!
Sidnal | 
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