Like the top of the world and the bottom of a stack of Tom Clancy novels, much of the ocean floor is unexplored. Dive into the unknown with today’s Groupon: for $84, you get an all-day diving trip for two from Looe Key Reef Resort and Dive Center in Ramrod Key (a $168 value).

Guests board the Looe Key Reef Resort and Dive Center’s 45-foot catamaran eager to explore sparkling stretches of water brimming with sea creatures. Consisting of coral fingers and sand channels, the Looe Key Reef spans 5 square miles and carries a protected status thanks to a variety of partially endangered fauna and Smokey the Bear's access to water wings. After watching the cerulean surface during a 5-mile boat ride, patrons scurry down the ship's ladders to dive or snorkel up to 30 feet into the depths at three locations along the reef. Angelfish, turtles, parrotfish, and nonbiting sharks fill goggles with colorful motion, dazzling aquatic visitors, and crystalline, 80-degree waters provide a comforting, almost-otherworldly experience as swimmers glide past ocean flora and extraterrestrial interlopers.

Reef trips depart daily with check-in at 9 a.m., and a dive into the Adolphus Busch shipwreck is available on Wednesday. Aquanauts on the wreck dive must have an open-water certification and an intimate knowledge of pirate chanties.

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