Wes Skiles Noted photographer's death will remain a mystery, medical examiner says

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I often wonder if diving with a full face mask would mitigate these kinds of accidents. Even if the gas mixture were wrong and he became unconscious, he would be breathing something besides water, and that might buy a little more time... but I say this with very little knowledge, as a conjecture. Opinions?

No one knows what killed him. He was diving alone. FFM's have their own issues so without knowing what happened, its just a wild guess.