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The sub did not hit bottom head on. It was a glancing blow that struck the left side of the box and scrapped down the port side. Was the sub at 30 knots or 40 knots? Does not matter. It was running a high speed. Subs running at those speeds are essentially blind if they intend to operate in their primary function - stealth. And yes, there is also clear buckling in that outer hull. This boat will be out of service for quite some time.
Existance of that underwater moutain was known. But due to the cost, charts have not been updated with recently discovered underwater topology. I believe this data was obtained from satellites.
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