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.
Okeanos Aggressor takes you on extraordinary dives where the wild things roam. See hammerhead, whale sharks, frogfish and more in this trip report from Cocos Island.
We've put together a photo gallery of 15 wrecks — some open to scuba divers and some not; some of their stories known to us and some not — that move us.
Previously thought to exist only in Bermuda, the elusive redback is a wrasse of a different color. Ned and Anna DeLoach found this fascinating fish in Bonaire.