Their banging away distress signals set up a pattern of sympathetic vibration which weakened the already sub-standard glued seam in the fiber hull, allowing pressure to crush and implode the sub.So, if the mini-sub imploded due to hull failure on the way down, and its wreck is now scattered on the seafloor near the Titanic's wreck... what explains the banging at 30-minute intervals over a 4 hour period (so that is at least eight separate incidents of banging?)
Unless the hull did not fail at first,
though the vessel was in some other form of distress, and the hull failure only came after somebody banged too desperately, to enthusiastically,
on their fragile little submersible....
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