The Canaries are volcanic islands that rose above the ocean floor thousands of years ago, and are still being shaped by volcanic eruptions to this day. As a result, the islands have an almost alien terrain with black sand beaches and dark stone cliffs. Belowground there are many caves and tunnels, some natural and others human-made. The Orchilla lava tube is not the only tube on the islands, but it is special. Compared to other lava tubes, Orchilla is not a popular tourist point. Unlike Cueva de las Palomoas in La Palma or…
