Snorkeling Christ of the Abyss is pretty fun (also commonly called snorkeling Christ of the Deep). This underwater statue is an identical replica of a statue called "Il Christo Degli Abissi" that is in the Mediterranean Sea off Italy. Learn more about the statue here.
To see the statue you are actually snorkeling Dry Rocks. It is a patch reef with spur and groove formation, with some very shallow areas. This is a decent snorkel spot, if a bit deep for snorkelers (at the statue). The statue is in about 24 feet of water, and resides in a small canyon. There is some nice underwater topography and coral around it, including brain corals. The Dry Rocks area is also known to have some decent Elkhorn Coral. But the area is heavily visited and shows signs of wear on the reef. So for healthy underwater sea life, it is not the pinnacle of snorkeling in the area.
This is definitely one of the most popular Key Largo snorkeling destinations, so if you don't mind a crowd, and have the time, you might as well check it out!
Check out the video below to get a sense for what snorkeling Christ of the Abyss is like (even though it is a diver).
Snorkeling Christ of the Abyss (Deep) Video
A couple of things you may find when snorkeling Christ of the Abyss (Deep) is that some of the hand fed Barracuda are very friendly. Rays are a common sight at this location. And you may also come across a wedding happening underwater at the statue. Hundreds of people have been married here.