Climbing Mount Everest without supplemental oxygen is one of mountaineering’s most extreme feats, demanding extraordinary endurance, skill, and mental resilience. In the thin air of the death zone, ...

Ever wondered what it feels like to ascend an 8,000-meter peak without supplemental oxygen? A climber explains the pain.

SAN DIEGO (FOX 5/KUSI) — Austrian-born Gerlinde Kaltenbrunner was 23 years old when she reached the summit of her first 8,000-meter peak. “Already from my childhood, it was my big passion to climb ...

Add Yahoo as a preferred source to see more of our stories on Google. As the Sherpa team fixed the last meters of rope to the 8,849m summit of Everest today, the Khumbu Icefall and the Lhotse Face ...

A Concord native is seeking to become the fastest person to climb Mount Everest without using supplemental oxygen.

As altitude increases and oxygen levels drop, climbers on Kilimanjaro face physiological risks that can turn a straightforward hike into a dangerous situation.

Four climbers went up and down Everest in under a week with the help of xenon gas—a record-breaking ascent that has ignited controversy in the mountaineering world. To reach the highest point on Earth ...