yeah those guys make the jack...had a buddy from hs that travels now welding underwater. Mostly dam repair work and offshore oil rig repair.
He makes ~250k per year and works no more than 6 months...
but the life expectancy is like 40 years old!!!
I looked into doing that a few years ago and figured it was much safer for me and my family for me to just have a land job
Back on the subject...
For anyone inexperienced (read: not a professional or with multiple years of experience), I'd not recommend welding in the rain!
First, getting shocked sucks! Getting shocked multiple times sucks! With weg gloves, ground, clothes, etc., it sucks even more. Most guys that have been shocked while welding haven't been shocked when WET! Its much more intense and sucks!
Second, weld quality will suffer.
Third, did I mention getting shocked sucks!
I've welded in 2' of water, wet from head to toe, in a hurricane during a plant shutdown and it flat out sucks! I had rubber gloves on under my leather gloves but after a certain point, the rubber gloves don't do any good. I couldn't get the rod in the stinger without getting lit up really bad. Really, I couldn't even hold on to the stinger without some tingle! I eventually had to get my helper (who was standing inside the penthouse, dry!) to load every rod for me because I was getting shocked too much!
Knowing the risks and being able to combat them is one thing. But, not knowing and doing something wrong can be harmful. Don't do it!