High on Mercury

Grouper populations are on the rebound thanks to protection efforts. But a major threat to these fish remains: mercury.

A school of angry-looking grouper

School of Sharks

School is in session! Shark experts pooled together in the nonprofit organization Sharks4Kids, teaching families around the world about sharks — setting the record straight.

Researchers and students on a boat, tag a shark

The Keys to Our Hearts

In 2016, DAN conducted research into the effects of diving on heart rhythm. Learn more about the research, methods and some early results.

A DAN researcher records an electrocardiogram (EKG) of a diver during a cardiac health study of divers over 40.

Carbon Monoxide: The Silent Killer

Carbon monoxide (CO), an odorless, tasteless and invisible toxic gas that could find its way into your scuba cylinder, has caused the deaths of divers all around the world.

Old woman in a straw hat is smoking a cigarette in her garden

A New Mission

Force Blue involves highly skilled military veterans in marine conservation efforts. The veterans work with marine scientists on initiatives including invasive species (lionfish) removal.

Two divers extract invasive lionfish

DAN Member Profile: Cristina Mittermeier

Cristina Mittermeier has been recognized as a Sony Artisan of Imagery, one of Outdoor Photographer magazine’s 40 Most Influential Nature Photographers and a recipient of the Nature’s Best Photography Windland Smith Rice International Conservation Photographer of the Year award.

Christina Mittermeier poses on a boat while holding a large digital camera

Diving with Dinosaurs

Considered critically endangered, smalltooth sawfish are under pressure from anglers who would take their rostrums as souvenirs and from the shark-fin trade. Many divers can go their whole lives without seeing one.

Three sawfish hang out at the bottom of the ocean

Member to Member: Sunscreen and Coral

Sunscreen pollution is a serious threat to the world’s coral reefs causing fast degradation. But, divers can combat the effects of this pollution with simple steps.

Dead tissue is shown on a brain coral. The coral looks green-yellow in color

So Others May Live

Can your training prepare you for absolute worst conditions? One writer took the challenge to find out what it was like being a rescue swimmer.

A member of the US Coast Guard swims toward a potential victim

DAN Member Profile: Andy Casagrande

Andy Casagrande is an award-winning cinematographer and a DAN member. He’s also obsessed with sharks. Read his story.

Andy Casagrande films alligators in the Everglades.