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My other home is in USVI St. Croix and Cane bay is famous for the wall for diving - walk up to it from the beach:

St. Croix is known for world class Caribbean diving. Beneath the turquoise waters the island is almost completely surrounded by a barrier reef teeming with coral, sponges, schools of tropical fish, sea turtles, and more. The most well-known part of this spectacular coral reef runs along the North Shore of St. Croix and is known simply as ‘The Wall’.

The Wall is created by the Puerto Rico trench located on the boundary between the Caribbean Sea and the Atlantic Ocean. The trench itself is 497 miles long and at its deepest point, known as Milwaukee Deep (located 76 miles north of Puerto Rico), it has a depth of at least 28,373 feet! For divers, the depth of the Puerto Rico Trench off St. Croix (about 3,200 feet) makes it a great site for deep diving, tech diving, and regular recreational diving. Even better, it can be accessed by shore or by boat at numerous dive sites along the North Shore of the island.

Source: http://www.gotostcroix.com/st-croix-blog/dive-cane-bay-wall/