RedactedNarrative: On July 11,2017 at approximately 1615 hours a 16 Ft vessel (FL3859PH) was seeking shelter from a thunderstorm in a boathouse. The storm caused large waves to enter the boat house area. One of the waves crashed over the gunnel of the vessel swamping it, causing it to begin sinking. Operator helped his grandson off of the vessel on to the dock and eventually ended up in the water. After salvaging several items (gas can, cooler etc.) Operator  climbed back onto the boat and then onto the dock. The boat was then tied to the dock. 
  
  The vessel is mostly submerged including the motor and various electronics.