Here’s everything you should know about sea turtles, including how long they live, how fast they can swim and where they lay their eggs.

The distinctive greenery between you and your buddy is likely the result of some exuberant biology, a productive party of photosynthetic plant plankton.

Clownfish can still win an underwater photo contest if you can create a standout image. Here's how to pull it off.

Macro diopters reduce your minimum focus, magnify the subject and create a crisper image.

ASK DAN: What should I do before and after diving to avoid accidents?

Marine biologist Dr. David Shiffman provides the ocean facts you want to know in this marine Q&A!

Becoming a technical diver starts with learning how to use new equipment and air blends.

Maps for marine navigation and weather, as well as tide and nautical charts, are some of the tools that can help you read ocean conditions.

The excitement of a new experience causes a missed predive safety check, triggering an emergency at the start of a night dive.