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When snorkeling underwater, objects look 25% larger (or closer) than they really are. Before your snorkeling adventure, practice judging distances by floating in very shallow water and reaching down to touch the bottom.
This will help you learn how far an "arm's length" is underwater. This is very important because when you are snorkeling in a coral reef in Antigua, you need to judge how far you are away from corals, fish and shells so you don't bump into a giant brain coral and hurt yourself while damaging a small ecosystem!