Colonel mustard is not cave certified, yet Mrs scarlet is.
With all the deaths of diving, we have one, the watson dive accident that has been a long drawn out case. It will end soon and no one will be happy of the outcome, course it is hard to prove underwater harm.
A few years back alaska, urchin or geoduck divers got into it and they were going to charge one diver with attemp murder.
Almost every underwater murder, suicide, are never revealed.
For obvious reasons, you die from scuba diving from mistakes.
Also a diver dies everyday throughout the world pretty much, so it is proven that it is divers fault, wether gear or human error.
Every thing I know to stay alive is just going to kill me underwater, at some point you make a mistake, or someone does for you.
Happy Diving