Diving with a Purpose in National Marine Sanctuaries
The hope is that through advocacy for underwater cultural heritage preservation, local communities across the country will discover and appreciate what marine historic sites can teach us.
THE OFFICIAL MAGAZINE OF DIVERS ALERT NETWORK
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When One on One Come Together in Greenland
Greenland is anything but green, as an ice sheet covers about 80 percent of the country. But the surrounding waters have great dive opportunities. Divers are able to get below the frozen surface and explore frigid wonders.
Evaluating Oxygen Delivery with a Demand Valve
The demand valve has been promoted as an easy-to-use system that conserves the oxygen supply since it releases oxygen only when the user inhales. However, poor mask fit can lead to underperformance of the valve. Several mask configurations were studied to determine their influence on oxygen delivery.
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Diving into an Ocean Climate Action Plan
Climate change poses a serious risk to the world’s oceans. Ecosystems are damaged and altering the physical nature of the ocean: its circulation, temperature, chemistry and color. Divers can help thwart climate change through their actions.
Maui: The End of the Rainbow
Maui is composed of several islands and offers divers of all abilities a range of attractions to see. While navigating trade winds can sometimes be a challenge, divers can work around these to find their right adventure.
Jeweled Water
An adaptation in male copepods enable them to quickly change from bright gold to near transparency — thwarting any possible predators. The gold flashes earned the name “jeweled water.”
Public Safety Announcement: When Should I Call My Doctor?
If you notice health changes during or soon after a dive, you should assume that it is related to diving. The most likely culprit is decompression illness (DCI), the likelihood of which increases with the severity of the dive. If DCI is suspected, you should receive first aid surface oxygen and a proper medical evaluation. Even if your condition is not DCI, first aid oxygen may still help and will not worsen your condition.
Beneath the Birds
Flying and encircling birds often act as beacons to what underwater predators and creatures could be below. Learn a geographic location’s bird species to gain a better understanding of a locale’s marine life.
Ten Years of the New Alert Diver
This issue of Alert Diver marks the 10-year anniversary of the Winter 2009 redesign of the magazine as a coffee-table quarterly. The new Alert Diver also celebrates the scuba lifestyle with articles about dive travel, underwater photography, ecology and marine biological science. The magazine is also available as a free download for both Apple and Android devices via the Alert Diver app and as an online flipbook.
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