This natural round hole rock formation carved out over centuries by the wind and the sea is over 10m/32ft in diameter and is 16m/52ft deep. There is a large window on 7m/22ft below the surface, which enables divers to leave and return from the open sea. On the seabed at the back of the Blue Hole is a cave, which is normally explored at the end of the dive. Along from the Blue Hole is the Chimney, which is a fissure large enough for one diver at a time before it opens up at the depth of around 8m/26ft into an area known as the Coral Garden.
Diving is available year-round. The average air temperature is 10-15C/50-59 F in winter and 21-30C/70-83F in summer. The average water temperature is about 14-17C/58-63F from December through April and 18-25C/65-77F from May through November.
Throughout the dive, one can see various species, including bream, parrot fish, large dusky grouper, saupe, cardinal fish, moray eel, lobster and octopus.