RedactedNarrative: VESSEL ONE WAS TRAVELING AT IDLE SPEED WHEN OPERATOR FELT A "SMALL BUMP".  OPERATOR INCREASED SPEED AND BEGAN TRAVELING WEST UP THE ARKANSAS RIVER.  OPERATOR NOTICED BOAT TAKING ON WATER AND PULLED UP ONTO A SANDBAR. ONCE LOADED ONTO A TRAILER, INSPECTION REVEALED A LARGE HOLE IN THE BOTTOM OF THE HULL TOWARD THE REAR OF THE VESSEL UNDER THE PASSENGER SEAT.