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Users must operate cylinders within design parameters, such as filling only to the rated service pressure and having cylinders inspected by formally trained and qualified technicians and requalified by a reputable, recognized test facility. More than 90 percent of ruptures occur during filling, so diligent inspection during this process is critical. Cylinders should operate safely throughout their entire service lives if users adhere to design and operating conditions.
Most decorator crabs belong to one of eight families in the superfamily Majoidea, commonly referred to as spider crabs. About 75 percent of the group’s more than 1,100 global species mask their presence by wearing disguises made from living organisms scissored from the landscape. They commonly hijack seaweeds, sponges, tunicates, bryozoans and hydroids. The crabs manipulate the purloined pieces of attire with their mouths before attaching them to one of the many fishhook-shaped bristles arranged in rows on the carapace, rostrum, walking legs and claw arms, depending on the species.
Opinions vary among dive medicine experts about how to mitigate the complex issues around children and diving, such as age requirements, training levels and limitations. Children are still developing both physically and mentally, which affects the decision about whether a young diver is fully capable or requires some modification. Concerns about decompression sickness, out-of-air emergencies and gas toxicities that occur at greater depths affect depth-limitation guidelines, which vary among the training agencies.
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Considered a form of preventative medicine by the American College of Sports Medicine, exercise has a wide range of positive physical, mental and cognitive benefits. This program should help keep you fit and healthy for your next dive. Use the modifications and challenges to suit your individual needs and fitness level. This timed program is designed to keep your heart rate elevated throughout the routine to strengthen your heart, lungs and muscles.
As this year’s Ocean Views photo contest celebrates the 10th anniversary of the collaboration between Alert Diver and the Nature’s Best Photography magazines for the 2020 Nature’s Best Photography International Awards, the collection of entries is replete with speedballs of significance. The quality of the photography is the best we’ve judged yet and coincidentally the most eclectic in subject and location. Viewed in aggregate, the 31,000 images and videos submitted by 2,000 entrants from 67 countries cover a range of destinations including polar, Caribbean, Indo-Pacific and even freshwater habitats.
Research has described the effects on human health of elevated partial pressures of carbon monoxide (CO) and carbon dioxide (CO2) while diving, but only occupational health and safety studies have covered solids such as oil mist and particulate matter suspended in air and only in terms of breathing at the surface.
The Solomon Islands is a diverse expanse of islands that is jam packed with marine critters, plant life, history and more. The conditions are hot and humid all year round, but there is a rainy season. Learn more about the Solomon Islands.
Blessed by geographic synergy with the sea and the coral reef, Bonaire is a special municipality of the Netherlands. Bonaire National Marine Park features 86 dive sites marked with their names emblazoned on yellow-painted stones, all with easy access from the shore.
The beauty of a dive resort’s house reef is that you can shoot a subject, return to your room, review the shot on your laptop, figure out how to improve it and reshoot it during the next dive. Diving a house reef in Sulawesi, Indonesia, before and after each day’s boat dives allowed me an abundance of time with the same creatures, and I was finally able to get what I was after — a shot that I will forever cherish.
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