since the first ascent in 1953 by sir edmund hillary and and tenzing nor gate reaching the summit hasn considered one of the greatest achievements in mountaineering. to call bush this task without the use of supplemental oxygen is even more remarkable. -- to accomplish this task. this month two american climbers a attempted to do just that. together they documented their journey in real-time on snapchat riverthe user name is no filter. here is a look. >> here we go. 11 miles. 11 meters. let's move. feels good. >> this is hair by everest. hashtag. new >> i think mine is better than his. >> another himalayan sunrise. say hit t to the world. a big snapchat, what's up? [wind blowing] >> corey and i going to sky right by 7-5. pin you up into the rocks. >> love 25,000 feet. oh, i'm not sure i do. but i do love that view. had turn around a little bit early. it's up to me to hold it down. at the summit. ridge.summer orthe wind i'm chasing running away from. >> corey, you're amazing! congratulations! >charlie: ballenger was forced o turn back to two health concerns but richard reached the summ