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I have a few similar looking cracks on my 16SL, near areas where there are protrusion into/through the hull--e.g. drain tubes, screws for mounting depth sounders--where the fitting was mounted incorrectly without sealant or where the sealant failed and water got into the foam/transom wood. Since I live in an area where it gets very cold in the winter, my theory (totally a SWAG) is that when the entrapped water froze it swelled and caused the cracking from the inside. Sound plausible?