On 12 May 1992 Carsolio made the summit of Kangchenjunga climbing solo. Wanda Rutkiewicz began the ascent with Carlos at 3:30 am on 12 May from camp IV, located at 7,950 meters (26,083 ft). After a dozen hours of climbing under heavy snowfall, Carsolio reached the top, becoming the only climber to do so that year. On his descent, between 8,200 and 8,300 meters (26,900 - 27,230 ft), Carsolio encountered Rutkiewicz. Although she had no food, she decided to bivouac and attempt the summit the next day. Carsolio was exhausted and could not convince her to descend with him, and she was never seen again.