Alert Diver Issue: Q2 2017

Oxygen Sensing in Rebreather Diving

May 1, 2017  Michael Menduno

Reliable measurement of oxygen is the technology that makes mixed-gas closed-circuit rebreathers (CCRs) possible. The first digital solid-state CCR sensor was made available in Spring 2017, and has greater accuracy and reliability.

A diver photographs a temperature logger that is lodged into a coral

An Emergency Ascent Just in Time

May 1, 2017  Christina Hepburn

Dive safety experts now advise divers to always dive with their tank valves completely open — not turned back a half or quarter turn. Are you up to date on the rules? Read one diver’s story.

An unconscious diver floats near coral

Member to Member: A Reef in the Living Room

May 1, 2017  Roger A. Grimes

Aquariums can house your own slice of indoor reef life — complete with colorful fish, corals and spunky crabs. Follow these tips to create your perfect aquarium.

A big saltwater fish tank stands proudly in a living room.

A Free-Flowing Failure

May 1, 2017  Peter Buzzacott, MPH, Ph.D.

Contrary to what you might expect, air will escape from a low-pressure hose faster than from a high-pressure hose because of the low-pressure hose’s wider opening.

Contrary to what you might expect, air will escape from a low-pressure hose (left) faster than from a high-pressure hose (right) because of the low-pressure hose’s wider opening.

Carbon Monoxide: The Silent Killer

May 1, 2017  Francois Burman, Pr.Eng., M.Sc.

Carbon monoxide (CO), an odorless, tasteless and invisible toxic gas that could find its way into your scuba cylinder, has caused the deaths of divers all around the world.