Trigger Maru (or Real Fleet Boat) along with Natural Sinking Mechanics (NSM) and Reflections on the Water (ROW) and you'll have a very polished, fullfilling experience. Oh and you'll need Run Silent Run Deep to (RSRD). Lots of abbreviations so I gave you the full names incase you've been out the loop a REALLY long time.
Just be aware, these excellent mods aren't all fully compatible with each other yet so you might need to pick and choose just one or two until the dust has settled from the release of patch 1.4.
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