RedactedNarrative: Vessel 1 was operating on plane in route to Put-In-Bay when the Operator reported feeling something strike Vessel 1;  he subsequently came down off plane.  Another Occupant aboard Vessel 1 checked the cabin and found some water on the floor and a door that had come off the refrigerator; the Operator attributed the water on the floor to rain.  The Operator then put Vessel 1 back on plane and continued underway for approximately 5 more minutes.  The Occupant then observed that there were several feet of water in the cabin and that the bow of Vessel 1 was getting lower in the water accordingly.  The Occupant then grabbed lifejackets while the Operator made a mayday call.  A towing service arrived on scene, dewatered Vessel 1, and towed them back to shore.