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I'm reading an interesting book, Concepts in Submarine Design, and from what I've read the operational depth is a little grey, not just a function of the material strength, seal strength, and bulkhead buckling pressures, but its response to low cycle fatigue, everytime a surface-to-deep-to-surface manuever is performed the hull undergo elastic deformation which after a while will wear the joints and reduce maximum depth, by how much and how quickly only the Navy knows. So the first dive will be the strongest with the maximum depth subjectively declining after months/years of low-cycle fatigue.
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That is thinkable . The Steel aging speed up by more Diving an Surfacing of the Sub. An old Sob never goes so deep than a New Sub . Is like a Car, it is staining wirth the Time.
BUT WHY is all Classfied for the Public... All secreet Services in the World know about military Aspects an New Military Equiptment of the opposing other Side in a minimum of Time, due Spy activities.
There is nor Role from what... Submarines, Aircraft, Tanks etc.
The Effect of the Classfied Info to the public is small.
When it is a Sectret then it has the Big Interest off all.
When the Real Things is Public then the Interest sinks.
Is with all Things in the Life.Think back to the own Child Time... What was with Secrets???
Greetings
Moc