Scuba divers on closed-circuit rebreathers can enjoy several perks, such as this close-up experience with a hammerhead shark.

Need some help with your underwater photography? Here are tips from frequent *Scuba Diving* contributor Tanya G. Burnett to point you in the right direction.

Dreaming of a Marquesas Islands getaway? Dive on the liveaboard *Itemata*, a 60-foot catamaran with exciting excursions and private dives.

Want to improve your underwater photography? Here are five ways to get better shark photos while scuba diving.