In 2017, Adam Ondra sent the first 5.15d-rated route in the world on a granite rock face in Hanshelleren Cave, which is known as one of the best climbing spots and features a 260-foot overhanging wall. For reference, Dawn Wall is rated 5.14d on the YDS. Ondra originally dubbed his four-year odyssey to climb the 150-foot-route Project Hard (since he succeeding in climbing it, it’s been called the hardest single pitch of rock climbing), but eventually renamed it Silence. The rating might change if more climbers can manage the route, but, for now, Ondra still has solo bragging rights.
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