Beautiful but deadly, this tiny critter is a close cousin of the blue-ringed octopus. Learn how pro photographer Jeffrey Chua de Guzman got the shot.

We're loving all the amazing photos you've submitted to the 2015 Through Your Lens Photo Contest, so we decided to give you a sneak peek at some of our favorites.

It's important for divers to be careful and aware in the water. Here are 5 useful tips for diving with marine life!

Check out this amazing video: A sperm whale sees a free diver spinning underwater and decides to join him!