The remains of a zip line that 3 young Spanish men, Antonio (Picholo), Andres (Moro), and Martin (Loco) used on August 11th, 2000. The wire was embedded in the rock wall opposite near the railway track. The three men jumped on the cable for greater speed but the wire detached from the rock wall and the men fell to their deaths. The Caminito del Rey was closed after this. You can find out more about the walk here.
A rather sombre reminder of the dangers here.