RedactedNarrative: Operator advised he launched V1 at the Narrow's Park boat ramp and began towing 2 tubers.  During the outing he struck an underwater obstruction but kept towing. A few minutes later he noticed the motor was struggling and he lifted the engine hatch and saw that V1 was taking on water.  He got the tubers on board and headed back to the ramp where he loaded V1 on his trailer and discovered  a hole on the port side toward the stern on the hull.