RedactedNarrative: OPERATOR STATED THAT HE STOPPED HIS VESSEL TO SET TUBING EQUIPMENT.  AFTER STOPPING, THE VESSEL BEGAN TO TAKE ON WATER.  THE BILGE PUMP COULD NOT KEEP UP WITH THE AMOUNT OF WATER COMING IN TO THE VESSEL AND EVENTUALLY FAILED APPARENTLY DUE TO A BLOWN FUSE.  THE VESSEL BEGAN TO SINK DUE TO THE LARGE AMOUNT OF WATER COMING INTO THE VESSEL.  ALL PASSENGERS ABANDONDED THE VESSEL AND WERE PICKED UP BY OTHER VESSELS IN THE AREA INCLUDING THE LAWTON PD VESSEL.  THE BOAT WAS PARTIALLY SUBMERGED AND WAS LEFT DRIFTING.  THE OWNER LATER RETURNED AND RECOVERED THE VESSEL AND LOADED IT ON ITS TRAILER.  UPON INSPECTION, SEVERAL SCRATCHES WERE FOUND IN THE HULL AND IT APPEARED THE BILGE PLUG HAD BEEN LEAKING DUE TO ROTTED RUBBER ON THE PLUG.  AREA OF THE ACCIDENT WAS NEAR THE CENTER OF THE LAKE.