Calypso Tunnel & Cave are in the north of Gozo, about 100m offshore due north of Lunar Hill at Xwejni Bay in Gozo. This dive starts along the edge of a reef which is an underwater extension of the headland above. On the face of this vertical wall there are two narrow horizontal cracks at 21m and 30m through which divers can pass, finding themselves in a large cave. This cave extends for over 30 meters and emerges right in front of a spectacular natural archway.