Operator put vessel in gear to relieve some tension from the anchor line so it could be hauled to relocate.  The vessel turned and the anchor line caught in the prop.  After lifting the engine two other men attempted to clear the prop when vessel took a wave over the transom and swamped.  The added weight of the 2 men and the extra water flooded the boat and it sank.  All occupants of vessel jumped/fell overboard and were rescued.  Vessel was a total loss.
Osterville                    