Welcome.
I would reconsider the underwater welder part, I know the pay is really good but the injury rate is close to 100 percent with a very high mortality rate.
I also would reconsider this option. It is a very hard work, very well paid, but it is not for everyone. You must have special physical and psychological capabilities.
And you also need a substantial technical knowledge, as the pre-requisite is everywhere to start the training only when you have already an high school diploma in technical topics.
After having witnessed in person the hard work on the platforms which my friend and instructor Fabio did for two years, and comparing it with the 5 years of very nice work that I and my wife did in touristic resorts, I would never choose the first and always go for the second....
Money is not everything in your life, what's the purpose of getting 5000 USD/month after taxes, if you are living on a platform for 9 months a year, talking only with the same 6 people, risking your life every day in muddy and cold waters, etc...?
Life in resorts was like paradise in comparison, you are among young, cute people ready to enjoy the life and be your friends (or more) for a few days, splashing in crystal-clear water making photos to sharks, manta rays, lobsters, and colourful reef, eating top-level international cousine at the resort's restaurant, spending the evening dancing or taking part in cabaret performances...
Ok, at the end of the year you look at your bank account and you see that is almost empty, as the year before, but who cares? You did live like a multi-millionaire, who else can spend so many months in those luxury resorts, doing the sports you love? Even multi-millionaires cannot do that, as they have duties and meetings and no time for enjoying their life!