West Greenland is where letters to Santa wind up every year, but it's not in some workshop where you'll find the magic. The real gifts are below the water's surface.

Every year, spawning salmon return to the same spot in Alaska as a part of their final act—here's what happens

Cage diving with great white sharks has come under fire in recent years.

There's much more to the relationship between an anemonefish and a giant sea anemone than a sense of camaraderie. Here's how they keep each other alive.

Scalloped hammerhead sharks and wedgefish are facing extinction, partly due to being caught and sold for their fins. This program gives local fishermen incentive to set those species free.

On a recent expedition aboard the National Geographic Endurance, one diver explores the lush biodiversity in the Falkland Islands' surrounding waters.

When survival is the goal, greater security comes with numbers. Here, we're taking a closer look at schools and shoals—plus, we'll tell you how to capture the best underwater photos.