Tyler Andrews’s latest mountain record attempt ended on the highest possible stage. Andrews reportedly reached the summit of Mount Everest from Base Camp in 9 hours and 55 minutes while using supplemental oxygen, setting a new fastest known time (FKT) for an oxygen-assisted ascent of the world’s tallest mountain. The previous mark was 10 hours and 56 minutes, set by Lakpa Gelu Sherpa in 2003, meaning Andrews lowered the time by just over an hour. Andrews began the climb on May 27, starting from Everest Base Camp at 7:11 p.m. local time. Upon completion, his team reported that he reached the summit at 5:06 a.m. on May 28. The time is still expected to go through formal confirmation, but if verified, it would reset the oxygen-assisted speed mark on Everest. The finish time is even wilder when you look at the route he took. Andrews began at Everest Base Camp, more than 17,500 feet up, and climbed to the 29,031-foot summit through the Khumbu Icefall, the higher camps, the South Col, and the summit ridge.…