Did we walk from down there?
This forms Part 3 of the " Dos Barranco circuit" but can be done on its own.
You join the walk below 'Los Catalones' and follow the waypoints. The tunnels are not very long but you should take a torch so you do not bump you head. You cannot get lost because you are simply following a canal.
So, stop and watch the Peregrines and falcons. Oh! and don't forget to take your camera.
This is the Complete Circuit