How is a climbing rope made? What is it made of? How is it tested?
The route Qui, FA'ed by Stefan Fürst in 1996 and originally graded 9a (5.14d), remained unrepeated for 23 years.
Join Adam Ondra as he bolts and projects new routes in Tijesno Canyon, Bosnia and Herzegovina, during the annual Drill and Chill Festival.
Ondra thinks it could be even harder.
Ondra digs into his video archive for some of the best unseen footage of Silence, the world's first 9c (5.15d).
Check out Rock and Ice's author page.
Eiter was the first and still only woman to climb a 5.15b.
"Brno is my hometown where I was born and where I still live," writes Ondra. "There were a few lines in my neighbourhood that were in my head since I was a small kid."