Not sure if this thread is still being viewed or not but i came up with an interesting idea. I plan on using a diesel engine and was thinking about the exhaust. And then i was thinking propeller shaft glands. What do you guys think about injecting the exhaust directly into a gland inside the shaft housing? this way the exhaust air and fumes etc will seal out any invading water.
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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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