RedactedNarrative: Vessel 1 was taking water on for an unkown reason and was able to get a tow by a bystander. Vessel 1 continued to take water and sank to the bottom of Lake Havasu without causing any injuries. No persons was on the vessel. The approximate value of vessel 1 is 5000.00. I observed no damage to the outside of vessel 1 that would of caused it to sink. Vessel 1 was retrived by a tow company per customer request. The owner of the vessel said that the bildge pump on the vessel was not operating.