Analysis of information sources in references of the Wikipedia article "Aid climbing" in English language version.
These included the hardest routes in the world at the time: first the Pacific Ocean Wall, and then later Sea of Dreams with its notorious A5 Hook or Book pitch—the first "if you fall, you die" rope length on the famed big wall.
climbing that employs mechanical devices (aids) to accomplish difficult maneuvers (artificial moves)
The aid route with hard and dangerous technical climbing is Warren Hollinger and Grant Gardner's 1998 Nightmare on California Street (A5), unrepeated despite strong attempts.
