RedactedNarrative: While returning to the marina, the vessel struck a log in the channel.  The operator did not feel the strike, however they noticed the vessel became unresponsive.  The wind and incoming tide pushed the vessel onto a shoal.  Once on the shoal the operator noticed the vessel was filling with water.  The occupants put on life jackets, and the operator jumped out to set an anchor.  They called 911 and were removed from the vessel by the Prince William PD marine unit.  Tow Boat U.S. arrived on scene and discovered the lower unit had been ripped off the vessel.  They plugged the hole where the lower unit was, pumped out the water, and towed the vessel to the Prince William Marina.