they know they have only minutes before trennis will suffocate.om the transceiver, it seems almost hopeless. but then by sheer luck someone spots his arm in the air and within minutes friends are digging him out. >> i couldn't believe that i was alive. and that nothing real -- you know, i could walk. when i went to get out, to go over it, there was a bank and i just shot straight in the air. >> but i still had that fear for the next two hours that i was just going to fall over dead. >> remarkably, other than being shaken up, he's fine. he walks away without broken bones or internal injuries. he says he learns one very valuable lesson. >> i looked back and think why that avalanche happened. i think it was to slow me down, so i think it made life a lot more important to me. >> like so many daredevils we met, trennis' near death experience didn't scare him away from his extreme sport. after the avalanche, he was back on his sled the next day. but now trennis says he pays more attention to safety, and lucky for us, he's still out there, shooting his e