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1

There are no statistics because no-one really keeps statistics about anchor types in accidents. Possibly also because anchor failures are extremely rare. However, individual case studies on specific anchor failures do exist. For example, http://publications.americanalpineclub.org/articles/13201215224/Rappel-Anchor-Failure-inadequate-Anchor-and-Backup It ...


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In his book "The Push" he describes this a bit. Most of the time they were using a running belay which means they were climbing at the same time with some pieces of protection in between them to avoid a deadly fall. This technique allows to climb very long "pitches" with a normal length rope. Once the leader runs out of gear, he makes a belay and belays the ...


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