Research

Which is Cheaper? OC versus CCR

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16 October 2018

  A few times a year, Add Helium gives a presentation titled ‘Why would I want a rebreather’ to groups of people interested in learning about the sport. Cost of a rebreather is one of the most common reasons people steer away from them. The steep price tag often keeps people from seriously considering buying a rebreather, and is now …

The Spurned Nip: A “Caustic Cocktail”

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16 October 2018

“The rebreather training was going great. The student’s initial apprehension of diving CCR was fading. Buoyancy control was not an issue anymore and even the drills started to feel like “second nature”.  But on day four during a shore dive, one of the students experienced the “caustic cocktail”. Fortunately, she recognized her problem and bailed-out as she was trained to …

Why Smoking and Diving are Incompatible

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16 October 2018

There are many reasons why one ought to quit smoking. But for all you smoking divers, I want to give you even more convincing arguments. None of this is new information.  However, some smokers have either never read it or are in denial.  Incidentally, non-smoking divers who want to skip this might want to reconsider unless your personal policy is …

Considerations for the Prevention of DCS “Do’s” and “Dont’s”

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16 October 2018

  Disclaimer: the information presented here is not personal opinion but based on the latest scientific evidence on DCS. The phenomena of DCS are still not completely understood. Neither do we have “rock-solid” prevention strategies. Instead, the prevention strategies presented here are suggestions. There are always >5% of the diver population that are outliers, i.e. who will behave completely differently …

Gradient Factors

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16 October 2018

This informative article gives excellent insight into understanding decompression theory along with gradient factors. Matti Anttila is an engineer with a M.Sc. degree in technical physics and Ph.D. in spaceflight instrumentation, so diving science is close to his heart. He was trained as a minehunter diver in the Finnish Navy in 1995 using semi-closed rebreathers. In the late 1990’s he …

The NERD is here

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16 October 2018

With the release of the NERD (Near Eye Remote Display), Shearwater Research has taken the concept of a rebreather head’s up display to a new level. Rebreather Head’s Up Displays have never been HUD’s in the traditional sense. Unlike displays used in aviation that project actual information on a screen within the pilot’s view, rebreather HUDs have traditionally been simply …

Sofnolime 797 Testing

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15 October 2018

    Molecular Products released some test data where it compared Sofnolime 797 against some competitors products under real-world diving conditions at APD’s ANSTI test facility. The results were surprising and showed up to a 20% difference in performance between sofnolime and other brands. The full technical report from Dr. Mike Clarke may be downloaded here.

Scuba Diving and Coronary Artery Disease

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15 October 2018

It is estimated that there are about 3 million certified scuba divers in the United States. A large number of these individuals are middle-aged or older and at risk for coronary artery disease. Cardiovascular disease is the third most common cause of death while diving and remains the principal cause of death in the general population. The development of symptoms …

LUX vs Lumen

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15 October 2018

When purchasing a dive light, many customers have heard the term lumen used to describe or rate the light output. What is a lumen? Is a lumen the best way to qualify light output? Halcyon has put out a great 3 minute video which illustrates the differences between lux and lumen. It also has some great cave diving footage. Enjoy …

IPE – Immersion Pulmonary Edema

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15 October 2018

“It is a beautiful sunny day. The ocean is calm and there is no current. In short: a perfect day to plunge into the sea and dive the Spiegel Grove. The water is comfortable at 81 degrees and the visibility is over 100 ft. We are a team of four divers on rebreathers and it is going to be an …