Utah Teens Credit Friendship and Prayer For Keeping Them Alive After Boat Capsized

Tiffany Stoker and Tylinn Tilley share the story of how they survived freezing waters after getting caught in a storm in Utah's Bear Lake.
2:25 | 06/05/15

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Transcript for Utah Teens Credit Friendship and Prayer For Keeping Them Alive After Boat Capsized
Now to tin credible survive story. Two young girls swimming for hours to safety after an accident left four others dead. Kayna Whitworth is here with their story. Reporter: Good morning the all of you. George, good morning to you. The local county sheriff is calling this the single worth tragedy he has ever seen on Utah's bear lake. It was supposed to be a summer kickoff celebration. This morning, two teenagers are speaking pout. We're like, unbreakable. Reporter: We're hearing from two teenage girls about their unbelievable story of survival. Monday, tiff any and tylin, best friended joined family friends lance, Kathy, another friend from school on a boating trip. We've got at least two individuals in the what person. The storm came in quickly. The waves were huge. Reporter: 76-mile-an-hour winds and waves ten feet high threw all passengers into the water. The waves separated tiffany and tylin from the group. The two trying to swim six miles to shore. Treading water for five hours. What kept them going? ? Just keep swimming just keep swimming ? Reporter: A song from "Finding memo." If we were letting fear overtake us, we wouldn't get out. Reporter: Rescue workers found them in the water. The two girls and thkathy, the only survivors from the original group of seven. Best friends bound. It's nice to have good friends that keep on encouraging you. If she was doubting the whole time, I don't think any of us would have been able to make it. They were found more than a mile from the boat. Paramedics think that by trying to swim, the girls most likely kept their body tech chair higher, which may have ultimately saved their lives. The storm was so severe, it rounded doox on the lake and everything. It came out of nowhere. Such a tragic story. Lucky for those girls. Back out to the park. Rob Marciano is there.

This transcript has been automatically generated and may not be 100% accurate.

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