You will gaze in wonder at Dean’s Blue Hole, a salt-water swimming pool dipping some 663 feet into the ocean floor right off shore. It is said to be the world's deepest blue hole and the second largest underwater chamber, with warm, calm waters. A school of tarpon hang in the shadows at 65 feet and friendly turtles and tiny seahorses sometimes come into the hole for a break from the ocean currents. The coral caves and sand banks on the side of the entrance harbour all kinds of tropical reef life, from tiny shrimps and colorful tropical fish to groupers and snappers. The free-diving world record was set at Dean’s Blue Hole in April 2007 by William Trubridge, who dove about 410 feet on a single breath. Every year, free-divers from all over the world come here and try to beat that record. You can also have a great experience diving on varied reefs, at a wreck sitting upright in 90 feet of water and along walls that begin at 40 feet and drop to 6,000 feet. Visit a reef and watch sharks feed right before your eyes. Arrangements can be made with the dive team at Stella Maris Resort Club for you to experience the best Long Island has to offer.