RedactedNarrative: Operator was returning to the Gray's Creek Boat Ramp on 8-2-2015 after a day of fishing. He was cruising on plane near the mouth of Gray's Creek when he heard and felt a loud "thump". He looked back and his outboard boat engine was no longer there. The transom was damaged and the boat began to sink rapidly. He and his passenger just had time to don PFD's before the boat sank in apprx. 7' of water. Operator used his whistle to alert persons on shore who launched a boat and rescued he and his passenger. There were no injuries. The boat is considered a total loss by his insurance company. Plans are to attempt retrieval of the sunken boat Wed. 8-19-2015.