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Despite the fact that that the world’s shark population is perilously shrinking, it is still possible to find places to dive with these magnificent creatures. And that may be just what they need most: seeing them at eye level cruising effortlessly against a strong current, always wary, always watchful, one learns to appreciate sharks for the miracles of evolution that they are, rather than as bloodthirsty killers. Appreciation on its own won’t save them from extinction (and us from global ecosystem issues and other very bad things), but if sharks are seen as tourist attractions rather than merely as soup ingredients or beach hazards, maybe the tide can turn in some of the places where they’re most threatened. So strap on a tank, check the seals on your camera housing and drop in to the middle of the food chain at one of these destinations.
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Cocos Island, Costa Rica

Cocos Island, uninhabited save for a ranger station, rises 300 miles offshore from Costa Rica. It’s a primordial volcanic outcrop in the middle of the Pacific and was the inspiration for Michael Crichton’s Jurassic Park. But while the island may be an interesting place to watch birds and swat bugs, it’s the deep waters surrounding it that draw divers. Cocos is the best place in the world to see hammerhead sharks, who school in the hundreds during the summer months. Drop down, cling to a rock outcrop, aim your camera up and watch the show. This is not easy diving. Strong currents, cold water and a remote location mean Cocos is not the place to go if you’re still the guy putting your wetsuit on backwards.