Fungus Rock is a huge boulder at Dwejra, west of Gozo. A variety of marine life can be spotted in the area. The reef drops down beyond 60 m, and the rock gives a nice shelter for the boat in case there is some swell.
Making your way back to the boat, there is a cave at 14 meters which extends far in. This you can visit before ending the dive.
Look out for lobsters and bigger groupers in depth. Also, nice scenery and usually good visibility is waiting for the divers here.