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There are many standards and guidelines for safe limits, including the results of various occupational health and safety studies on the effects of extended exposure. For diving, the situation is different. So what are safe limits for recreational diving with much shorter exposures than navy divers? Particularly, what is a safe limit for carbon dioxide (CO2), the most abundant potential contaminant?
Orca populations have been on the decline for decades,. We have to address the challenges to their survival to preserve these magnificent animals.
The Straits Mackinac Shipwreck Preserve off the coast of Michigan is a unique destination for divers, with a variety of shipwrecks preserved in the area’s cold, fresh water.
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With appendages directly on their heads and the ability to camouflage, cuttlefish are interesting creatures. They also have unusual courtship rituals.
Tobias Friedrich has amassed a portfolio of breathtaking images. He hopes to communicate uniquely so that when people view his portfolio they see things differently than they have before.
Understanding migration routes of blue whales may lead to more protection of blue whales in those locations.
Catalina is often considered a quick day trip off the California coast. With little rain and picturesque views, however, Catalina could be your next adventure.
Some first-stage scuba regulators have a shared low-pressure hub. Purging the second-stage regulator to release pressure from all hoses before disassembling gear causes gas in the other hoses to move backward toward the first stage. The gas could carry debris from the other low-pressure hoses and possibly through the first-stage regulator into the hose being used to vent the system. Performing regular maintenance, checking your hoses and noting any difficulty in breathing or inflation during your predive check should prevent hose degeneration from causing an underwater incident.
A passionate cave diver and scientist, Dawn Kernagis, Ph.D., has been involved in numerous exploration projects since the 1990s, including as a crew member in the NASA Extreme Environment Mission Operations (NEEMO) 21 underwater habitat mission in 2016. A recipient of the 2018 Undersea and Hyperbaric Medical Society’s Young Scientist Award and other distinctions, she oversees the Human Health, Resilience and Performance research team at the Institute for Human and Machine Cognition. Read about her studies on human performance optimization and risk mitigation for operators in extreme environments.
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