In the Sierra’s Greenway there are thirty tunnels. Of these, the longest is the Castle’s tunnel, with 990 m., near the Coripe’ station. Those that exceed 150m. or which have a curved path, are illuminated, some with conventional and other with solar systems. You can also enjoy the darkness in the unlit ones … it is a very mysterious feeling. In summer the coolness in the shade of a tunnel is appreciated, a fact that goats sometimes take advantage of. At sunset, you may be able to see some bats emerging from their shelter within the vaults.
For its construction the opening and inside progress in the interior of the tunnels was done by hand using the curing of curls and wooden beams, as in mining, to support the walls and the ceiling. The formwork of wooden frames formed the first concrete of the time, a leading construction technique in the 1920s in Spain. The mouths are finished with quarry stones and offer the appearance of a bridge eye in which the “key” stone is located in a strategic place.
This majestic work built with the stoic work of the people of the place, who changed the plow by the beak and the shovel, is still present as a silent witness of past times.
Shortly before the tunnels were restored, the picture was very different from the current one. Some were used for the cultivation of mushrooms, as witness the name of some of them, or they served as sheepfolds. Others did not resist to live such fortunate uses and suffered erosion, collapse or flood by leaks.