Warship design and construction, terminology, navigation, hydrodynamics, stability, armor schemes, damage control, etc.
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I was told by my old Mech Eng techer (who used to work for the royal ordinance) that Navy gun barrels were stiffened by being sealed at both ends and then pressurised until the inner material had stretched beyond its elastic limit (plastic zone) but the outer layer had not, thus when the pressure was released, the outer layer tried to shrink onto the permanently deformed inner layer, thus creating very high stress and a very stiff barrel. (He always boasted that we Brits had a very much better 'droop factor' (oh-er misses) than the Yanks because of that treatment... Anyone else heard of this?