Cave diving at south west rocks is one of the best cave diving spots in the world. Fish rock cave is 120 meters long with part of it completely dark. At the end of the cave once it's light again you'll pop out and swim with schools of grey nurse sharks!!
Cave diving at south west rocks isn't only for thrillseekers, if you're scared, don't worry! You can stay at the entrance of the cave and stay with turtles, gropers and rays!
There are a couple of diving companies who offer tours of fish rock cave so look around for the best price.