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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.
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 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.
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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.”
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.
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.
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.
Teaching someone to dive doesn’t happen without risk. If an incident or accident occurs, students may find themselves footing expensive medical bills for which traditional health insurance provides minimal or no coverage. DAN Student Medical Expense Coverage is dive accident insurance designed specifically for new divers in training that DAN fully subsidizes, so there is no cost to students or their instructors.
The sensations started in the left foot but symptoms spread and worsened. Although in a remote location, one diver shares their story of emergency evacuation and treatments through DAN.
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