RedactedNarrative: Operator left little hicks mt. Shoreline heading eastbound when operator stated that a wave from another vessel breached her vessel and the vessel took on water and sank and rolled upside down ejecting operator. Poi was approximately 400ft. East of east shoreline of little hicks mt. Por was not determined. After recovery of vessel one; it appeared the molding that binds the two hulls together was defective and allowed water to enter bottom hull causing vessel one to sink resulting in engine damage.