Oxygen Toxicity Research

Jay Dean, PhD, is a professor of molecular pharmacology and physiology at the University of South Florida (USF), where he studies the effects of oxygen, carbon dioxide, and barometric pressure on the mammalian central nervous system.

hyperbaric research radio telemetry chamber

Diver and Dive Operator Ethics

My first reality check as a dive professional came after a week of working with a couple. Every day they asked for private dive guides and customized support.

illustrating an in-water rescue tow back to the boat

The Dive Light: A Tool for All Divers

The dive light is essential equipment that can benefit all divers on most dives. There are several types of lights with various uses and a few key considerations you should make before purchasing. There is no one-size-fits-all approach to dive lights, so each diver must carefully consider their own goals and needs before deciding which model is most useful.

Lights are tools for all divers

The Philippines

During the pandemic I asked my partner, David Doubilet, a question: “If you had one full year to dive in one country, what country would it be?” I thought he might need some time to consider, given he has spent five decades documenting the sea for National Geographic.

A backlit Rhinopias scorpionfish

Teamwork in the Depths

Imagine yourself aboard a dive skiff on a tropical blue sea, getting ready to dive with legendary underwater photo pros Marty Snyderman and Michael Aw and extremely talented masters of the genre Tanya Griffin Houppermans and Vijay Raman.

green sea turtle off Dumaguete in the Philippines

Joint Pain and Diving

Your effort to relieve joint pain involves achieving neutral buoyancy, but that requires some physical exertion.  Additionally, nr-axSpa often progresses into ankylosing spondylitis with inflammation where tendons, ligaments, or joint capsules enter the bone, which can lead to spinal fusion and reduced mobility.

having back pain

My Path to Cave Diving

Every documentary filmmaker eventually dreams of making an IMAX® film. After all, it’s the biggest, most impressive film format in the world. Who wouldn’t want to see their film on a 70-foot screen? For years I dreamed of making my first IMAX film.

Crystal Caves of Abaco

Freediving French Polynesia

The chronology of my last sojourn to French Polynesia was much longer than the travel time from Seattle, Washington, to the capital Papeʻete on the island of Tahiti.

A bird’s-eye view from Moorea


We’ve all seen tragic images of suffering marine animals entangled in monofilament line or other marine debris.

disentangle a North Atlantic right whale