Seeing this shark's wide-open mouth bearing down on you might seem like a diving nightmare — until you realize it's just a basking shark.

 

Unlike their carnivorous brethren, basking sharks are filter feeders. They prefer the taste of zooplankton and couldn't chomp down on you if they wanted to. A diver lucky enough to encounter one of these elegant beasts may entice its playful curiosity; they are known to be tolerant of nearby boats and people.