Water can enter through even the smallest cracks, but how do you avoid water entering ships at the propeller shafts. I mean…seals in general, must fit tight, but here you still have to allow for movement. How do they do it?
In: Engineering
Seals.
The pressure isn’t very high, so a thin film of pressurized grease pushes the water back. Sometimes there are problems, even with [gazillion dollar destroyers](https://news.usni.org/2017/04/05/navy-found-fix-uss-zumwalt-engineering-problem ).
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