1 of 13
Credit: Wayne Davis
On Aug. 22, 2012, fish spotter Wayne Davis spotted this school of 20 scalloped hammerhead sharks. He found the animals above Oceanographer's Canyon, 100 miles southeast of Nantucket, Mass. Millions of years ago, rivers carved out massive canyons here. Now, submerged in hundreds or thousands of feet of water on the edge of the continental shelf, these canyons are ideal spots to find fish and other large marine life.