RedactedNarrative: A vessel was reported aground on the rocks. Operator of vessel was found unconscious on the coach inside the vessel. The operator was wakened and escorted to the shore where he refused medical treatment. During a post accident interview, the opertor could not remember operating the vessels that moring. A second interview was conducted on 7/21/2018 and the operator stated that a medical examination conducted after the accident indicated that he suffered a concussion from a fall while on the vessel. One injuried.