The Everest. Totmjanin has risen without oxygen

On May, 23rd 2006г Nikolay Totmjanin has risen on top of the Everest without use of oxygen.
Alexey Bolotov and Sergey Surmonin the height 8000м have reached(achieved) and have begun descent(release). Boris Korshunov has refused an output(exit), having remained in Abc