history on Instagram: "In May 1998, 40-year-old Francys Arsentiev became the first American woman to reach the summit of Mount Everest without supplemental oxygen. She climbed with her husband, Sergei, but the attempt quickly turned deadly. On the way down from the summit, Francys developed severe altitude sickness and frostbite. She collapsed at over 8,000 meters, unable to move on her own. Sergei tried to bring her down but was forced to leave her temporarily to collect oxygen bottles. When he

Historical Images & Videos on Instagram: "Inside caves, darkness hides dangers the eyes cannot see. Many explorers say that when they take their first steps inside, the silence and still air feel harmless. But that’s when the smallest detail can decide between life and death. In countless stories, adventurers who ignored this test watched their torch flames suddenly vanish, as if something invisible had stolen the air. What seemed like nothing more than mysterious darkness became a deadly trap: