The dive depth/hull cracking stuff is a myth. The reason behind titanium hull is that it is lightweight compared to the steel one and is less magnetic. Which is why papa/Alfa/Sierra had generic work/crash depths.
Mike was special, one of the kind, deep diving sub. For some reason in 60s and 70s we though that 1000m dove depth was to become standard for the 3rd-4th gen boats.
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Grumpy as always.
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