"Riotous color 50 feet down in Cozumel. Every dive is spectacular."
"Diving the USS Liberty off the eastern coast of Bali, I found Nemo!"
"Yoga may be relaxing, but underwater it can make you feel even more weightless than on land!"
"The yellow and blue eye highlight of this little fish really pop against the red of the sponge."
"While on a boat dive off the Kahala Coast of the Big Island of Hawaii, I shot this nudibranch—it's just over an inch in length and very delicate."
"I was snorkeling off Disney's private island in the Bahamas when this kid came out of nowhere diving for shells."
"Vacationing in Maui, Hawaii: a sea turtle at Black Rock."
"A sharp-tailed eel found in Bonaire."
"A lacy scorpion fish found in Bali—very rare."
"A penguin found in the Galápagos."
"Tim, a diver from Vancouver, B.C., did not see the white-tip shark as it swam over him."
"This view presented itself in only 15 feet of water, and it looked like an aquarium: brain coral, Christmas tree worms, and butterfly fish."
"A coralline sculpin against a red volcano sponge—some stunning contrast."
"A purple jellyfish shot in an aquarium."
"This squid was swimming along the top of the water as we were snorkeling at the Great Barrier Reef."
"Divers from the International School of Port of Spain, Trinidad, diving in Tobago."
"This photo of a butterfly fish was taken in the Maskelyne Islands in Vanuatu."
"A unique exhibit at the Oregon Aquarium interspersed glass art with colorful sea life. Here, a fierce-looking lionfish swims among colorful disks and bowls."
"A stingray in the Bahamas."
"This shipwreck is located about 100 feet underwater off the coast of Lahaina, Maui, Hawaii. We were in a submarine at the time."
"An Easter skunk anemone fish, found in Palau."
"A pair of butterfly fish, taken underwater at Lighthouse Reef in Belize."
"An anemone discovered in 100 feet of water off of Rachel Carson's Salt Pond Preserve in Bristol, Maine."
"Surrounded by tens of thousands of silvery fish in a 'bait ball' in Bonaire."
"While scuba diving in St. Martin, I was playing around with a $13 underwater camera. When diving, I have a hard time staying still underwater…let alone getting my subjects to stay still! In this case, though, I was thrilled I caught him in motion!"
"Underwater garden, snorkeling in Bermuda."
"Diving the Gran Cenote, Tulum, Mexico."
"Taken while diving in Key Largo."
"The exquisite sea life at the California Academy of Science in San Francisco."
"The clear blue waters at Diver's Cove in Sand Harbor State Park, Lake Tahoe, make it perfect for taking underwater photographs."
"This huge wreck, intentionally sunk, has attracted all sorts of life. This fantastically colored parrot fish gazes at the radar dish."
"The seaweed blenny is one of the more goofy blennies to be documented."
"Discovering underwater treasures like this sea-urchin colony while snorkeling in northern Palawan of the Philippines."
"Look closely, and you can see the eyes and outline of a stingray hidden in the sand. Took this picture with a disposable camera at John Pennecamp Park in the Florida Keys."
"This school of convict tang was making its way through the reef, eating everything in its path, on the North Shore of Oahu."
"The thalassinidean shrimp is one of the weirder creatures you will find underwater in the Florida Keys."
"This was taken in Mystic Aquarium in Mystic, Conn."
"This dusky jawfish was my favorite friend from my Key West jaunt!"
From reef diving in Cozumel to finding Nemo in Bali, <i>BT</i> readers plumbed the depths to capture amazing displays of life below the water's surface.