Did a PADI Advanced qualification out in Koh Tao in the early 00’s. Loved every minute of it at the time – always been into natural history and really enjoyed getting my Jacques Cousteau on. Did it exactly once thereafter (admittedly a pretty cool dive on the volcano in Santorini).
No chance I’d ever attempt to resurrect it while still mountain biking – I barely have room for one expensive, time-consuming hobby in my life.
I’ve ridden a few times with a professional diver who liked to MTB when he was back in the UK from a job. Sounded like a Hell of a job, often requiring him to be at depth with a crew of other guys for days on end. His workmate was one of the guys who rescued the cook from that wrecked boat off Nigeria.