Fron is a small quarry a few miles south of Vivian Dive Center. While not an official dive site, the quarry is used by police and army divers for training purposes and its depth (40m) makes it a great site for deeper diving!
Getting into the water is not easy and involves a 45 degree scramble down a scree-slope, but it's worth the effort as visibility is good, even at 30m+.
Fron's depth and poor access unfortunately make it unsuitable for training dives, but for anyone qualified it makes a refreshing change from the normal inland sites!
There is a boyed hut at around 20 meters and plenty of abandoned cars.