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She sank with all hands Danny, it is believed they either opened the hangar door before it fully surfaced and the hatch to the sub was open, there was speculation that she may have suffered from escaping gas, possibly from the batteries so was making an emergency ascent, or dived.
There are films of the wreck on YouTube showing the hangar doors open.
https://www.youtube.com/watch?v=7UJIyen6p18