Last year, scientists used a small, remote-control submarine with a bunch of cameras on it to get close-up footage of great white sharks off the coast of Mexico.  And I'm sure they collected all kinds of useful data.

 

 

But for OUR purposes, the video is cool because a great white ended up ATTACKING the sub, which was basically the same shape as a human leg.  So the video is essentially what it would look like if a shark started chowing down on YOUR leg.

 

 

(Search for "Slate.com Attacked by a Great White."  It attacks it at 1:29.)