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MY HUSBAND, BARRY, AND I got our dive certifications in Cozumel, Mexico, in 1994, and since then it has been one of our favorite destinations. We spent three weeks diving there in the summer of 2001, following our routine of running, exercising, and diving twice a day.
MANY DIVERS AND NONDIVERS ALIKE envision the ideal scuba dive as a coral reef in warm, clear water surrounded by a myriad of beautiful fish. River diving, on the other hand, is drastically different and not for the faint of heart.
OSKAR FRANBERG LEADS THE RESEARCH GROUP in marine systems engineering at the Blekinge Institute of Technology in Karlskrona, Sweden, and is managing director of the Swedish National Underwater Technology Center. This father of three is an engineer by training and has been active in dive research, especially rebreather physiology, for more than 20 years.
Before you dive, you and your doctor should consider some possible effects of having a low platelet count. In some cases, it may affect the body’s ability to clot properly in response to injury.
AS A WILDLIFE OFFICER, I spend countless hours on the water. As an instructor for the National Association of Underwater Instructors (NAUI), I have also spent a lot of time teaching and diving.
MINORS HAVE BEEN DIVING FOR DECADES, but the incidence of scuba diving injuries among them remains poorly studied.
I have learned to read the minute details of each athlete’s technique and interpret the impending risk that arises as they push themselves in pursuit of a personal-best performance.
THE THREE GASES GENERALLY used in recreational and technical diving are oxygen, nitrogen, and helium. Nitrogen is the most abundant and is usually the default gas, but no one seems concerned about its purity, although the U.S. Compressed Gas Association (CGA) provides purity levels, or grades, for various applications.
READERS WILL KNOW THE BYLINE “David Doubilet and Jennifer Hayes” from scores of National Geographic magazine features. Working as a team they have photographed the wild ocean from the tropics to both polar regions and even some rather unusual aquatic realms in between.