Formed over 20,000 years ago from the eruption of the Corona Volcano in northern Lanzarote, this impressive tube stretches approximately 4.7 miles, with nearly a mile submerged underwater.

Formed over 20,000 years ago following the eruption of the Corona Volcano in northern Lanzarote ... and a blend of dry and submerged cave sections. The three notable parts of the tube are Cueva ...