Joined some friends for a couple of dives in the cool (71 degrees) clear (viz 100+ ft) waters of Blue Grotto. Nice facilities with rentals. Lots of parking, picnic tables, and space to spread out even on a VERY busy Saturday at the end of the summer. The dive itself begins in a fresh water basin that opens up into a very large cavern with depths into the darkness around 100 feet. A lovely dive if the crowds and classes aren't around. Enjoy the Dive Bell located at the top of the cavern mouth at 33ft where you can take out your regulator and take off your mask to talk to your buddy. A really unique experience. I would say that this place is good for two dives and then it's time to go across the street to Devil's Den. 28 bucks to enter. Stay off the silty bottom and arrive early on weekends as the many classes will conspire to make the gin clear viz more milky. Enjoy!