awesome! have looked at that link and that has given me a good grounding from which to research different methods. I have designed a shaft seal which uses Turcon (A rubber like material capable of withstanding very low and high temperatures) seals. Not an original idea at all, copied it from this one
Just changed the design slightly to make it more cost effective.
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Crash dive!!!! --- We're in shallow waters sir.... 
Hull damaged
Radio destroyed
Sonar destroyed
Rudder damaged
Diesel engines damaged
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