It's the underwater encounter of a lifetime: diving with Narwhals in the High Arctic. Read how this photographer befriended these marine mammals.

The latest underwater collection from scuba diver Judy G takes us on a journey through the Andaman Sea via wide-angle photography.

In the mighty Amazon, giant snakes, vicious piranhas, prehistoric reptiles, and other fearsome creatures wait in the fresh water. Welcome to Brazil.

Interview with National Geographic Photographer Brian Skerry on saving the ocean and what it feels like to be honored as a Sea Hero.

Corals in motion: You won't believe this amazing underwater timelapse video. Earth is amazing.

Want to swim with whales? Here are the best places to get in the water with sperm whales, the largest toothed predators in the world.

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Freediver has the encounter of a lifetime with seals in Cape Town, South Africa. Watch the video now!

Watch underwater photographer Thomas Peschak on TED Talks as he discusses his work and marine conservation.