Red Sea Photo Safari
The Red Sea is a great diving destination with blue waters, pristine coral reefs and diverse ship wrecks. Learn more about diving the Red Sea in this photo safari.
THE OFFICIAL MAGAZINE OF DIVERS ALERT NETWORK
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Member to Member: Cutting for Conservation
While working as a dive professional, I always carried a cutting device, which I rarely used. Although required by standards, it seemed like a “nice to have” rather than “need to have” piece of equipment. My experience off Mexico’s Pacific coastline taught me that cutting devices have a place on every dive trip. In a sea fraught with dangers, carrying a cutting device is just as much about rescuing corals from ghost-fishing nets or animals from discarded rope and plastic as it is about saving yourself or your buddy.
DAN Member Profile: Dick Rutkowski
Dick Rutkowski spent six years in government service, co-created NASA’s Neutral Buoyancy Laboratory, wrote dive accident management manuals and more.
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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.
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.
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.
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