RopeWiki reference: http://ropewiki.com/Incidents:Webbing_failure_in_Cerberus There is a discussion on this incident on the Southwestern Canyoneering Facebook group (not a public group, but easily joined if you have a FB account). Excerpts: A group that ran this canyon in December 2015 recall they may have replaced this anchor. It was a color they were using that day. If that were the case, this webbing was only one year and two months old. Given this anchor was roughly in the watercourse, it may indicate chemical, rather than UV factors at work. Summary A webbing anchor tore free, causing a canyoneer on rappel to fall 15 feet. He landed in wet sand. Incident Time: 12:40pm Rappel: 16 of 29. Patient: Male, ~25 years old, 235 lb+ with backpack Group size: 9 Cerberus is a lengthy technical canyon, even for advanced groups with many years of experience. The frequency and length of rappels, anchoring challenges, and advanced down-climbing make for an arduous day in hostile conditions. Those who participate in this difficult, potentially dangerous trip are richly rewarded by teamwork, accomplishing the extraordinary, and experiencing a part of death valley few have ever seen. Rappel 16 was a "deadman" anchor with the base rock being about 2 to 2.5 feet in diameter. The base rock was set into the soil and was not movable, it had several smaller rocks stacked on top of it. The existing webbing was 1" tubular webbing tied in a loop with a water knot, the loop went around the base of the rock and the knot was at the back of the rock. Front side angle of the webbing was approximately 30 to 40 degrees. The anchor rocks and webbing was inspected prior to using it. The webbing was visually inspected all the way around and there was no significant wear or discoloration. A single (9mm low stretch) rope rappel thru the quick-link and blocked the rope with a Figure 8 Block. This anchor was backed up with a meat anchor with the station attendant attached to the "pull" side of the rope. The rappel consisted of a two stage drop, an initial drop sloped 15' down to a 10' ledge, which terminated in another 15' vertical drop, the anchor was set 10' back from the initial drop.