Starting from L-Għasri Valley, Cathedral Cave is located on the right-hand wall just outside this spectacular narrow gorge. The entrance is only 5m below the surface and leads to a concrete domed vault where you can surface in a gigantic air pocket, the ceiling of which is approximately 15m above water level. This cave faces due west, and it is best in the afternoon when it is brightly lit by direct sunlight. A small crack in the cliff face 2m above the water provides fresh air and adds to the light in the ‘dome’. At the rear of the cave, where the ceiling is only a metre above the surface, there is a shaft hewn from the rock straight to the cliff’s top. This was once used, like a well, to fill the saltpans above. Today, however, this shaft is covered by a stone slab. The seabed in the cave is littered with huge boulders, and the view of the blue ocean outside is breathtaking.