nobody wants to die ('cept for people looking to suicide). The waiver is an acknowledgement that what they're doing is dangerous, and could cause them to die. As an adult, you have the right to accept this risk, if the reward for doing so is worth it in your eyes.

Unless, of course, if those signing the waivers were mislead.

Yes, but the waiver probably didn't say 'you have at least a 10% chance of dying'.

You're going almost 4000m underwater.

What percent should it have said? 10%? 5%? 30%? 90%?

Anything other than "We've tried to make it safe, but there's a lot higher than 0% chance of death" would seem a lie.

People die climbing Everest regularly, and I don't see anyone claims the climbing industry is under-disclosing.

Because these are inherently lethal activities, that a reasonable participant engages in despite knowing the risks.

Actually there's a huge backlash to guided "adventure" tours bringing rich tourists who have zero business being above 7000m into the death zone. Everest was bad enough (it's at least not a technically difficult climb) but now they've expanded to K2, which is absolutely insane to send an amateur to.

There's a difference between a well prepared Everest expedition and someone selling a submarine experience in a poorly designed craft. There is a difference between inherently dangerous activity and wanton stupidity.

>>Because these are inherently lethal activities, that a reasonable participant engages in despite knowing the risks.

One can as far as say they indulge in it for the 'kick' this sort of risk brings. The ordinary is boring for most of these people. They don't want to have fun the same some one making $90K/yr does.