Hinrich, thanks for confirming that, but there was a second part to the question. If the hulls were cracking on the alfas from fatigue, then what changes were made to the design for the Sierra class subs that afforded them a deeper test depth, and have extended their life to the point where, aside from the one that collided with the Baton Rouge, none have required extensive hull repairs?
And obviously they believed they solved the issue with the mike class sub, since they upped the test depth to over 1000 meters and did not seem concerned to operate her at extreme depths.
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Americans make better submarines? No my friend, Russia makes better submarines, Americans just make better computers 
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