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All this talk about the sub not withstanding the pressure wouldn't account for the knocking noises.
They heard the knocking every 30 minutes. That's a pretty even interval, like something that someone would do to let you know they're still alive.
My money is on power failure. That explains why the sub couldn't surface as well as why the communications system failed.
true, yet experts have said that they do not know if the knocking was from the sub. That the knocking could have been from a boat or boats passing by miles away.
heck,
The last knock could have been the sound of the sub imploding