I would think the best place to look for a comprehensive list like this would be from within commercial diver training organizations like; ocean corp, commercial diving academy, divers academy, etc... though I doubt they would be willing to share that information with just anyone.
Otherwise you could search job placement websites like monster.com, jobs.com, careerbuilder.com. All of them should have a filter for Marine Service and IT. Let us know when you get your list together. :O)