After reviewing all the news coverage, I conclude that the greatest issue that caused the silence from the sub is …. Implosion. Only takes a tiny leak or crack - and a millisecond to implode like an aluminum can.
Good news, it’s an instantaneous death. Bad news, no way for anyone to know and search/rescue is futile.
We may never know. And their families.
I would like to know how many successful dives this sub made that deep. It’s risky business.
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