Ryan,
WELCOME TO THE AWS WELDING FORUM!!
Welding has many interesting fields. Underwater welding is sure one of them. As that is an area I don't know much about I would encourage you to go up to the top here and click on 'Search' then type in 'underwater welding'. There are many past posts about it and schools named as well. Links are also provided that should assist you in your search.
He Is In Control, Have a Great Day, Brent