Hm.... those are some good points Mocbo. If you use diving depths that deep its too bad that the game doesn't make use of the deep sound channel like it should.
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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