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Rewilding Coral Reefs 

By Mark Erdmann, PhD

Q1 2025

Though I believe rewilding coral reefs is a valuable approach, it requires a strong, established foundation of good old-fashioned marine conservation. I view reef rewilding as a tertiary marine conservation strategy that we should attempt only after the fundamentals of an effective marine conservation strategy (often anchored with a well-managed marine protected area) are in place. 

Used Rebreather Scrubber Disposal

Text by Frauke Tillmans, PhD, and Seph Fox; photos by Julien Leblond

Q1 2025

Sorb, or scrubber, plays a critical role in rebreather diving, as it is responsible for removing carbon dioxide (CO2) from the diver’s breathing gas. Small granules or pellets absorb exhaled CO2 and allow oxygen to pass through. This chemical process allows rebreathers to recycle exhaled air, limiting gas consumption and allowing longer dives. 

Homemade Dive Gear

By Charles Stewart

Q1 2025

The “Historic Dive Helmets” article from the Second Quarter 2024 issue of Alert Diver triggered memories of my father, Burton Stewart, and his best friend Leno Prestini. In 1935 they crafted their own dive gear from a water heater, milk can, garden hoses, and Goodyear balloon material for the suits.

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Blue Dragons 

Text and photo by Henley Spiers

Q1 2025

These small yet magnificent mollusks live in the open ocean and are at the mercy of wind, tide, and currents. As they float upside down just beneath the surface, their blue-striped bellies point upward while their metallic backs are counter-shaded when seen from below.

Diving in Remote Areas

By Francois Burman, PE, MSc, and JoAnn Haack, MSE

Q1 2025

Diving has inherent risks. The human body was not designed to be underwater, and drowning, decompression illness, barotrauma, hazardous marine life injuries, and preexisting health issues all require an emergency response. Diving in remote areas introduces additional risks, especially access to medical care.

Exiting a Plane During an Emergency

Q1 2025

Most flights are uneventful, with the worst experiences being an occupied lavatory or unexpected turbulence. Emergencies can happen, however, and aircraft passengers need to be prepared to react quickly and efficiently. In an emergency, knowing the proper evacuation procedures for your flight can mean the difference between safely concluding your trip or reaching a different final destination. 

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