Not in Denial

HAVING DONE THOUSANDS OF DIVES since I started in 1964, primarily off the coast of North Carolina, the shipwrecks and dive profiles there are familiar. Overall conditions couldn’t have been […]

When History Seemingly Repeats Itself

IN 1983-84, REEFS THROUGHOUT THE CARIBBEAN, FLORIDA, AND BERMUDA experienced one of the greatest mass mortalities of a marine species ever recorded when an unknown waterborne pathogen killed more than […]

Diving After Brain Surgery

I RECENTLY UNDERWENT BRAIN SURGERY. The surgery was successful, but now part of my skull has been replaced with mesh. My neurosurgeon is brilliant but does not know how the […]

Sherri Ferguson

SHERRI FERGUSON, MSC, IS THE LAB MANAGER at Simon Fraser University’s hyperbaric chamber, located at an altitude of 1,200 feet (366 meters) on Burnaby Mountain in the outskirts of Vancouver, […]

Alert Diver Q3 2022 Researcher Profile

Emergency Oxygen

IT WAS A BEAUTIFUL, WARM SATURDAY IN THE PACIFIC NORTHWEST. We were conducting two checkout dives for an advanced open-water course at a popular dive site in Puget Sound. I […]

emergency oxygen DAN first aid courses 3.0