RedactedNarrative: Owner had recently purchased vessel and was the 1st time taking it out.  While heading back to port he noticed excessive water in the boat and determined there was a leak in the cooling system of inboard engine.  Vessel was starting to sink when Harbor master arrived and extricated all four persons from the water with injury.  Vessel sank completely. 
NameOfBodyOfWater: Plymouth Harbor
NearestCityTown: Plymouth                      