THE OFFICIAL MAGAZINE OF DIVERS ALERT NETWORK

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Cocos Island

By Andy Sallmon

Q4 2022

“Pura vida!” our dive guide, Sergio, exclaimed with a relaxed smile. Eight dive buddies, Sergio, and I just had an incredible experience: A 35-foot-long whale shark swam a few feet over our heads at one of the better-known dive sites at Cocos Island, Costa Rica. It silently came and went, seemingly carefree, like a giant spotted apparition sliding out of sight into the deep blue.

The Ocean Less Traveled

By Juli D. Goldstein, DVM; photos by Stephen McCulloch

Q3 2022

TALK TO ANY HUMAN UNDER THE AGE OF 13, and they have probably been asked, “What do you want to be when you grow up?” I was just 3 years old when I knew I wanted to be a veterinarian. Growing up on coasts — first Cape Cod, Massachusetts, and then Southeast Florida — I […]

Diving With My Dad

By Kat McKay

Q3 2022

I WAS 13 YEARS OLD THE FIRST TIME I WENT SCUBA DIVING. My family was on a trip to Cancun, and my dad took me and my sister, Carrie, who was 11 at the time, for a scuba lesson. We did a low-risk resort-style dive, going no deeper than 25 feet. But we loved the […]

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Trouble in Galápagos

By Ben Strelnick, NREMT, W-EMT

Q3 2022

DAN EMERGENCY SERVICES RECEIVED A CALL via satellite phone from a liveaboard anchored off a remote island in the Galápagos. A DAN member was concerned about their bunkmate exhibiting symptoms following the day’s dive activities. The diver had completed four dives that day. Although she began to show symptoms following the second dive, the inexperienced […]

Popping the Question: What is a DSMB?

By Christine Tamburri and Wally Endres; Photos by Stephen Frink

Q3 2022

SURFACE MARKER BUOYS (SMBS) AND DELAYED SURFACE MARKER BUOYS (DSMBS) are common and essential safety devices. These brightly colored, inflatable tubes, sometimes called safety sausages, are critical pieces of equipment that divers should take on most dives. Divers most often use them as signaling devices to mark their locations below the surface and alert boat […]

Oxygen Cleaning of Dive Gear: A Two-Part Series

By Francois Burman

Q3 2022

IN THE PREVIOUS ARTICLE, we settled on the recommendation that equipment used to control any breathing gas mix containing 25 percent oxygen and above at typical scuba cylinder pressures should be designed and considered suitable for oxygen use. Possible debates aside, we’ll examine what oxygen cleaning means. How often should gear be oxygen cleaned, and […]

Teaching Rescue: Am I Qualified?

By Jim Gunderson and Christine Tamburri

Q3 2022

WHEN ASKED TO DESCRIBE THEIR FAVORITE COURSE, many divers will discuss the challenges and triumphs they experienced during their rescue class. Instructors often describe rescue as the most rewarding course they teach. It is often the first course in which divers begin thinking about others more than themselves, so it’s little surprise that it stands […]

Emergency Oxygen

Q3 2022

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 had just gotten some divers out of the water, and we were debriefing onshore as divers from a basic open-water class exited the water with […]

Sherri Ferguson

By Frauke Tillmans, PhD

Q3 2022

SHERRI FERGUSON, MSC, IS THE LAB MANAGER at Simon Fraser University’s hyperbaric chamber, located at an altitude of 1,200 feet on Burnaby Mountain in the outskirts of Vancouver, Canada. She is a scientist working in aerospace and dive research, an experienced recreational, technical, and commercial diver, and a mother. How did you get into diving? […]

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