As long as we are engaging in freewheeling conjecture...
What are the odds that a cave diver using a (homemade?) rebreather and in a situation where an emergency ascent was not possible would encounter the only gas cylinder that we know of on Cozumel contaminated with enough CO to deliver a fatal dose of it? I don't know; I'm just asking.
What are the odds that a cave diver using a (homemade?) rebreather and in a situation where an emergency ascent was not possible would encounter the only gas cylinder that we know of on Cozumel contaminated with enough CO to deliver a fatal dose of it? I don't know; I'm just asking.