JEREMY KERSHAW: "He was kind of frantically trying to get new clothes on and eat. It was a scary situation because I was really at the last several hours of the race, and so I was really at the end of my reserves."

Luckily, the racer had a mobile phone. Mr. Kershaw was able to call a support crew. They transported the racer to safety by snowmobile.

Mr. Kershaw says it was a good reminder of how things can go wrong.

JEREMY KERSHAW: "If you're not paying attention, things can go south very quickly, particularly when it's that cold and you're that tired."

STEVE EMBER: Every year, only about half of the racers are able to finish the Arrowhead 135. And that is partly what attracts athletes like Mr. Kershaw.

JEREMY KERSHAW: "I'm more drawn to it by the fact that there's so much carnage, that people don't finish, that it's so tough."

This year was not as bad as some years. The Celsius temperature at the start was only minus-twelve.

Casey Kruger from Minnesota broke the ski record by fourteen hours, finishing in just over twenty-two hours.

The first female biker across the finish line, Eszter Horanyi from Colorado, finished in a little over eighteen hours. She broke the woman's record by two hours. Ms. Horanyi arrived just two and a half hours behind the winning biker, Kevin Breitenbach of Alaska.

And Jason Buffington, the doctor from Duluth, set a new record for runners. He finished in just over thirty-seven hours.