On the face of this very vertical wall there are two narrow horizontal cracks at 21 m and another one below it at 30 m through all of which divers can easily pass finding themselves in a large cave. This cave extends over 30 m through the reef and emerges right in front of a spectacular natural archway. There is also a very large cave towards the west not far away from Calypso Tunnel.
Calypso Tunnel
This dive, 100 m offshore due north of Marsalforn tower, starts along the edge of a reef which is an underwater extension of the headland above.