Polish climber Andrzej Bargiel has achieved a groundbreaking milestone by becoming the first person to ski down Mount Everest without the use of supplemental oxygen. After reaching the summit of the 8,849-meter mountain, Bargiel descended to Camp 2 and then to base camp, spending 16 hours in the perilous 'death zone' where oxygen levels are critically low. His descent was complicated by heavy snowfall, which is unusual for autumn expeditions. Bargiel's previous attempts to ski down Everest were thwarted by dangerous conditions, but his successful descent adds to his impressive record of skiing down the world's highest peaks. His team celebrated this historic achievement, and Polish Prime Minister Donald Tusk acknowledged the significance of this feat on social media.