The vast structures that result do more than awe snorkelers.

这个庞大的珊瑚礁结构是更甚于敬畏的水压起重机所能做出的结果。

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A school of snorkelers struggles to keep pace with a whale shark—the world’s biggest fish, which can grow more than 60 feet (18 meters) long.

虎鲨是世界上最大的鱼类，成年时他的身长可以超过60英尺（约为18米），图中一群潜泳者正在努力追上这只虎鲨。

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The annual event, held in honor of International bog Day, requires that flipper-outfitted snorkelers swim along a 360-foot (111-meter) stretch of bog without using conventional swimming strokes.

一年一度的该项赛事是为了纪念国际沼泽地日，比赛要求穿着脚蹼的潜水者不使用常规的游泳姿势游过一条360英尺(111米)的路程。

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Divers and snorkelers can become members of REEF (for free) and enter their own fish survey observations online.

BBC: Underwater volunteer vacations

Bull sharks, lemon sharks, great hammerheads and several others prowl the coral reefs near shore, often seen by snorkelers and divers.

BBC: Protecting sharks off Florida��s eastern coast

For those who prefer to stay closer to the surface, Calanggaman Island offers an exquisite coral wall visible to both divers and snorkelers.

BBC: Swimming with sharks in the Philippines