The document lists the 10 greatest mountaineers globally, highlighting their unique accomplishments and contributions to the sport. Notable figures include Reinhold Messner, who was the first to summit all 14 eight-thousanders without bottled oxygen, and Edmund Hillary, the first to reach the summit of Mount Everest. Other climbers mentioned include Gerlinde Kaltenbrunner, the first woman to achieve the same feat, and Apa Sherpa, who holds the record for summiting Everest 21 times.