RedactedNarrative: Vessel 1 was in operation with nine persons on board.  As Vessel 1 exited the open zone and entered the "No Wake" zone, the Operator brought Vessel 1 down to plowing speed.  The line of travel then took Vessel 1 across the "No Wake" line of buoys, then another line of orange buoys marking a dredge operation.  The motor of Vessel 1 then struck a submerged dredge line.  The collision with the dredge line resulted in all persons aboard shifting forward, with one occupant falling, but sustaining no reported injuries.