Probably minefields. Where is this happening? You can always try restarting a new game and use external camera to see the exterior of your boat. Then you will have your answer.
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"Turning enemy ships into marine habitat since 1986!"
Mods Loaded:TMO 2.2, RSRDC, MaxOptics, Strategic Map Symbols, Stop The Shouting 
OR:
RFB, RSRDC, Maxoptics, SCAF, Strategic Map Symbols and the sanity-saving "stop the shouting".
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