Diving off Cozumel, Mexico with Bull Sharks, turtles, barracuda in beautiful blue waters surrounded by coral reefs.

The bull shark (Carcharhinus leucas), also known as the Zambezi shark or, unofficially, as Zambi in Africa and Nicaragua shark in Nicaragua, is a shark commonly found worldwide in warm, shallow waters along coasts and in rivers. The bull shark is known for its aggressive nature, predilection for warm shallow water, and presence in brackish and freshwater systems including estuaries and rivers.

In 1956, Mexican film director Rene Cardona shot the movie Un Mundo Nuevo under the waters of Cozumel at what is now known as Cardona Reef. In 1957, this film was translated into English and broadcast over American television as A New World. Cardona's movie is often confused with Jacques Yves Cousteau's 1956 documentary Monde du Silence, but Cousteau's film was shot entirely in the Eastern Hemisphere, and it was Cardona's film that brought the crystal clear waters of Cozumel to the attention of American divers. Cousteau did not visit the island for the first time until the late 1960s, years after the island's dive industry was well established.

Scuba diving is still one of Cozumel's primary attractions, mainly due to the healthy coral reef marine communities. These coral reefs are protected from the open ocean by the island's natural geography. In 1996, the government of Mexico also established the Cozumel Reefs National Marine Park, forbidding anyone from touching or removing any marine life within the park boundaries.[10] Despite the importance of healthy reefs to Cozumel's tourist trade, a deepwater pier was built in the 1990s for cruise ships to dock, causing damage to the reefs, and it is now a regular stop on cruises in the Caribbean.

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