Puerto Rico protects leatherback hatching grounds.

Troy Bodden is working to keep Utila a natural paradise by improving the lives of its residents.

How does an underwater photographer capture a diving kingfisher for a stunning photo? See how Manfred Delpho caught this bird on film in Meadow Pond, Gudensberg, Germany.

In the Bahamas, you’ll find a Caribbean reef shark for every 100 yards of underwater habitat. And when feedings occur, sharks appear in droves, swimming increasingly tighter circles around the divers gathered in an arc on the sand.

An Alaska dive site called Smudges just might be the best jellyfish dive anywhere.

St. Croix-native Kemit-Amon Lewis is working to conserve and grow coral reefs in the U.S. Virgin Islands.

Diving with Great Hammerhead sharks was something photographer Steve Hinczynski dreamed about for years. During his five-day trip in Bimini, he had the diving experience of a lifetime.

The judging for our 2013 Underwater Photography Contest has come to a close: Here are our finalists, from sharks to coral to sea turtles.

Magnificent eating machine hoovers victims like a seafloor vacuum.