I'm doing a school project on an underwater welder career. I need to know the salary range for an underwater welder. Thank you.

You may wish to search this site, this question has been answered many times.

Beginning welders may earn 30,000 or so, and top welders will earn 100,000 or more. The area they dive in, the depth they dive to, the type of welding they do all makes a differnce

Here is a search engine with sites
AOL Search results for "underwater welding union"