Quote:
Originally Posted by denis_469
About Alfa you need understand that 700 meters is safe depth, but 900 meters is crush depth. About speed - all may be. During WWII one German submarine type VIIC write, that in Gibraltar transfer was speed 11 knots. So may be and 42 knots.
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Indeed crush depth for these boats was deep but we do know not only did they retire early most in the early 80's they also had some issues with hull cracking which was published by the Russians in 1995.