Scuba Cylinder Rundown

The 11-liter aluminum 80, aptly named for its 11-liter internal volume and 80-cubic-foot (2.3 cubic meter) capacity when filled to its 200 bar/3,000 PSI rated pressure, is by far the most common cylinder. Just because it is the most common, however, may not mean it is the right one for you. Cylinders come in a […]

Not Only for Diving

WHILE DAN’S SUITE OF EDUCATIONAL PROGRAMS focus primarily on diving, graduates of the courses can apply the skills and knowledge they learned to many circumstances outside the aquatic realm. My wife and I were driving home from a weekend getaway to Myrtle Beach, South Carolina, heading northbound on Interstate 95. As expected, I-95 was moderately […]

Florida Keys History Underwater

Beneath the ocean waves, our underwater history provides evidence of events and people that have contributed to our maritime landscape. Research on submerged sites is an ever-evolving frontier where discoveries continue to happen in places previously unknown to maritime historians. Diving in the Florida Keys National Marine Sanctuary (FKNMS) is an exceptional experience that offers […]

More Than a Sore Shoulder

I REMEMBER SITTING AT MY COMPUTER while thinking about all the ibuprofen I had been popping for the past 18 hours and wondering why I still had the dull, aching pain in my shoulder. Could this be more than soreness from carrying gear back and forth from our shore entry point or exertion from a […]

The Argonaut Octopus and the Jellyfish

I don’t expect to see animals much larger than my thumbnail while I’m drifting on a night dive in the ocean. So I’m surprised when a translucent skirt of tentacles half the length of my arm breezes past. This creature is a behemoth in a sea of Lilliputians, so I kick hard to catch up […]

What Does It Mean?

A PROFESSOR OF EMERGENCY MEDICINE and researcher at the University of Maryland School of Medicine, Stephen Thom holds medical and doctorate degrees from the University of Rochester. He previously led various clinical programs, including hyperbaric and emergency medicine, and a research lab at the University of Pennsylvania. What is your academic background? My medical specialty […]

Going Up

Every night as the sun slips below the horizon, countless aquatic creatures begin migrating up from the deep in what is quite possibly the greatest show on Earth. Seeking nourishment in shallow water, zooplankton must risk a perilous journey upward, avoiding a gauntlet of predators while remaining in the safety of darkness and then returning […]

When Should the Rescue Begin?

DIVING INHERENTLY CARRIES AN ELEVATED LEVEL OF RISK because humans cannot survive underwater without specialized equipment. When things go wrong, an effective rescue is vital for a favorable outcome. Most rescue diver courses teach students basic techniques to apply after something goes wrong, but better courses also provide techniques to prevent incidents from occurring in […]

Program Spotlight: DAN Offers New E-Learning Courses

Dive safety starts with understanding the risks in diving. Prevention requires taking appropriate steps to mitigate these risks, and effectively responding to incidents requires preparation and training. Online learning is a practical and convenient way to improve your knowledge and make you a safer diver. DAN members have access to a compendium of free e-learning […]

Celebrating Young and Old in Turks and Caicos

A TWO-WEEK LIVEABOARD in Turks and Caicos was the first dive trip I’d taken in 18 months, and I quickly learned that this small island nation has plenty to offer adults and children alike. It was Family Week, so I got to spend time with the younger generation of divers and their parents. West Caicos […]