RMI Guides and Climbers were ascending the route above 12,500’ today when they came upon a party in need of help. A major crevasse had collapsed at the 12,700’ level with at least one member of an independent climbing team standing on it when it fell. The RMI Guides stabilized the climber, treated the resulting leg injury, and transported the climber down to 12,300’, the top of Disappointment Cleaver for a helicopter evacuation. By the time all of this was accomplished a summit attempt was no longer feasible for the RMI Summit Team. The team has returned safely to Camp Muir and will to descend to Paradise.