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From what I have read and seen in actual experience aboard ships is that the area of the hull that supports the reduction gears is the most deeply honycombed and rigid part of the ship. Imagine a long rod thrown through the air flexing along its length "whiffle, whiffle, whiffle", that's exactly what a ship does! This oscillation can vary from a gentle shimmying to violent shaking in almost any plane and even tortionally along the length of the hull. It's totaly common to see some feature of the ship rocking forcefully in some sea, and the next day perfectly calm while something else is affected. Props really vibrate! when a prop is cavitating from a major change in speed or direction, which is common in naval ships, stuff on the fantail will literally dance around on the deck! accompanied by a loud roar, the ship vibrates like an earthquake. These are things that I experienced while on a 980 ft., 180,000 ton AOE, which is a pretty large ship. All of the stuff on the site about warships is right on, vibrations and all. Marine engines have watercooled exhaust manifilds, which are pretty heavy compared to a regular exhaust manifold, but I do not think that type of manifold would be used if the exhaust were to go out a vertical stack.
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