Funnily enough, I know someone who was an underwater welder. From the conversation with him, it was a multi-month certification course, so I went ahead and look

Funnily enough, I know someone who was an underwater welder. From the conversation with him, it was a multi-month certification course, so I went ahead and looked it up online. https://www.commercialdivingacademy.com/underwater-welding.da https://www.commercialdivingacademy.com/underwater-welding.d... That's just one program, but it appears diving is the first thing you learn. Edit: If you look at it from the context of a normal welder, they have an understanding and control of their environment before they start welding. You don't realize it because you've been understanding your environment since you were born. To do underwater welding, you'd first have to understand how you operate in that work environment, and then they can teach you how to start welding in it.