Steven Weber Jr and his girlfriend Kenesha Antoine were on holidays on Pembla Island and staying in a submerged cabin when Mr Weber popped the question on Thursday.
Ms Antoine posted a video on Facebook showing the moment Mr Weber, a Louisiana resident, swam up to the bedroom and held up a handwritten note to the window.
"I can't hold my breath long enough to tell you everything I love about you. But everything I love about you I love more every day!" it read.
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