Cryptobenthic Fish
A recent study published in the journal Science shows the unexpected and remarkably large role of tiny, bottom-dwelling reef fishes for coral reef productivity.
THE OFFICIAL MAGAZINE OF DIVERS ALERT NETWORK
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Where Mermaids Fear to Tread
Technological advances have enabled divers to explore once hard-to-reach caves, including Weeki Wachee Springs in central Florida.
Megalodon Ledge Diving
The indomitable megalodon shark, the largest fish that ever lived, tore its way through the whales and dolphins of the world’s oceans for about 13 million years before dying off about 2.6 million years ago.
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Piston or Diaphragm: Does It Matter?
There are two main ways for these devices to respond to changes in supply pressure, demand and depth in real time. Diaphragm-sensed regulators use a flexible element to adjust to these changes and to ensure constant outlet pressure and flow relative to depth; piston-sensed regulators use a sliding metallic piston that moves to adapt to these variations.
A Rosy Affair
The rosy razorfish survives with a head as hard and as sharp as a cleaver that enables the fish to burrow beneath the sand when threatened.
The Paper Nautilus
The paper nautilus is a pelagic octopus in the family Argonautidae. Researchers disagree about the number of distinct extant species. Nautiluses can quickly jet-propel themselves through the water, making it difficult to photograph them.
Responsible Tourism in the Galápagos and Beyond
The Galápagos National Park Directorate protects 97 percent of the land in the Galápagos Islands. This protection aims to conserve the habitats and wildlife in this special place while supporting a sustainable economy. Yet increasing tourism threatens to degrade the natural resources that attract visitors here in the first place.
Marine Megafauna Close to Home
Marine megafauna can be found throughout North America — groupers, dolphins, blue sharks and more. Learn about mega fauna encounters that will inspire your next dive trip.
Program Spotlight: Coast Guard Approves DAN Basic Life Support: CPR and First Aid
Every year about 735,000 Americans have a heart attack; more than 2,000 Americans will have one on any given day. Heart attacks and other cardiac emergencies can happen anytime, anywhere and can be deadly without immediate medical intervention. A CPR certification will enable you to save a life no matter where you are. DAN created its Basic Life Support (BLS): CPR and First Aid course to give people the knowledge and skills they need to recognize and respond to some of the most common emergency situations.
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