view few others have seen. >> ladies and gentlemen, not only is my phone not dead, but that is adrian balancen >> reporter: only adrienne did it without supplemental oxygen. high altitude sickness forced cory to turn back. >> the summit is just through the clouds. up above us. >> reporter: on his way down, cory met a group of climbers who supplied him with supplemental oxygen. the oxygen gave cory the energy to reach the summit first, from there he cheered on his friend as he made the final push. >> 3,995 feet right now. i've never seen anybody work so hard for anything in my life. my brother, we leave the summit behind. >> reporter: in 37 days, adrian logged nearly 140 miles while acclimating to the high altitude. he consumed 22,000 calories on a diet that allowed him to consume air at roughly 8% oxygen. adrian reflected on the experience. >> i feel super emotional. i cried so hard yesterday on the summit. in the last ten meters to the summit. i would never want to climb everest without oxygen again, and i am so proud and happy. >> reporter: he said cory's support gave him the energy he neede

. >>> for more than a year now, we've been following the story of adrian balancen jer and corey richardsin climbing adventurers who have been trying to snapchat their way to the top of mt. everest. the trick is, they were attempting the feat without the use of cananed oxygen. they made it to the top of the world. >> reporter: this week both adrian and corey reached the peak. but it was adrian who accomplished the ultimate goal of making it without extra oxygen. the highs and lows of it all shared with the world on social media. >> here we are. one year later. >> you did it! >> reporter: their body the pushed to the limit, cory and adrian spent less than 15 minutes on top of mt. everest, taking in a view few others have seen. >> ladies and gentlemen, not only is my phone not dead, but that is adrian balancen jer with no oxygen. >> reporter: only adrienne did it without supplemental oxygen. high altitude sickness forced cory to turn back. >> the summit is just through the clouds. up above us. >> reporter: on his way down, cory met a group of climbers who supplied him with supplemental oxyg