That's "extreme" with quotation marks:

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Thus, if we are to understand the world, we should live somewhere between judgement and amazement — Alfredo Lopez Austin

I scuba and ride, and would try scuba-riding for the novelty and fun of it, but some of the stuff that guy was riding looked sensitive. Good thing the Sierra Club doesn't care about underwater habitat.

I don't know that a full ridged was a good choice for that terrain. And I think he should raise his seat.

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I want my Mtb!!!!

Man... the equestrians are gonna nail this guy to the wall for leaving tire tracks on the silt.

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Best riding advice I ever got... "make sure you have air in your tires"

That was in Key Largo at the Christ of the Abyss statue. I've dived there several times. In the 80's there wasn't much hubbub about reef damage, but these days considering that more and more of the reef dies every year from water run-off, prop damage, sewage and cold snaps, if you get caught damaging the reef you better have some some deep pockets. Depending on the level of damage, the fines can stretch into the tens of thousands of dollars.

I'll stick to extreme ironing. Cheaper and less rust.