RedactedNarrative: The watercraft (a sailboat) was anchored out from the island and the two occupants were sleeping. The watercraft capsized due to the winds from a thunderstorm in the area. Both individuals (the owner/operator and a passenger) entered the water underneath the boat and were separated. The passenger was able to swim approximately 1 mile to the north shore of the lake, where he summoned help from the owner/operator's brother. They contacted 911 prior to taking a pontoon boat back out on the lake to search for the other man (owner/operator). He was also able to swim to the lake's north shore and seek help at a residence on the lake. He was transported to the hospital with non-life threatening injuries. The passenger had no injuries and refused medical treatment. It is unknown if life jackets were used or if alcohol was a factor.