look at this stuff
Clark Little is a shorebreak art photographer. He takes pictures of waves from inside and underneath them.
Here are some of my favorites, if you really like them check out his book. Make sure you have someone strong to flip the pages for you though. It is 182 pages, over 100 photographs, 12x12 size, weighing close to 7 pounds.
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See more of his work at his flickr page.