RedactedNarrative: Vessel was exiting the Lynnhaven river channel, entering the Chesapeake Bay, turning on a westerly track towards the Chesapeake Bay Bridge Tunnel at approximately 20 mph when it struck a chain attached to a  set of pilings located off shore of the Lesner Bridge.  The two occupants were thrown into the water.  The T-top and console were detached from the vessel and went into the water.  The vessel continued underway into the Bay. Both occupants were able to swim to shore and the vessel was found the next morning circling near the 4th island of the CBBT.  Members of the Virginia Beach Fire Department went aboard the vessel and were able to get it stopped by removing wires until the motor shut down.