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The Best of InDepth in 2019

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InDepth just completed its full first year as a blog, and what a year it has been! Over the year, we’ve published 92 stories covering exploration, diving science and medicine, technology, education, conservation and technical diving culture. We would like to take this opportunity to thank all of you, our readers, for your interest and support, and also thank our illustrious contributors who made the blog possible. To celebrate our first year, we wanted to look back on the most popular stories of the year. Here are the Ten Most Read Stories of 2019.

1. Gradient Factors in a Post-Deep Stops World 

World-recognized decompression physiologist and cave explorer David Doolette explains the new evidence-based findings on “deep stops,” and shares how and why he sets his own gradient factors. His recommendations may give you pause to stop (shallower).

2. How Deep is Deep? The 20 Deepest Tech Shipwreck Dives and How They Compare to Dives in the 1990s

Photo by Barry McGill.

The advent of mixed gas technology in the late 1980s/early 1990s followed by the introduction of closed-circuit rebreathers a decade later has enabled technical divers to explore increasingly deeper shipwrecks. How much deeper?Here InDepth editor Michael Menduno examines the 30 deepest technical shipwreck exploration dives as viewed today, including who did them and how, compared with the 10 deepest dives from the 1990s. The results will likely amaze you. One data point: The deepest wreck dive in the 1990s, that being the SS Edmund Fitzgerald, aka ‘The Fitz,” laying at 529 ffw/162 mfw, is now #11 when viewed from today. That is to say that the top 10 deepest shipwreck dives today were all conducted after 2000.

3. Decompression, Deep Stops and the Pursuit of Precision in a Complex World 

In this four-part series, Global Underwater Explorers’ (GUE) founder and president Jarrod Jablonski explores the historical development of GUE decompression protocols, with a focus on technical diving and the evolving trends in decompression research.

4. GUE Configuration vs. Jacket-style Configuration 

In this five-episode equipment series, GUE Instructor Dorota Czerny discusses the differences between a GUE-configured equipment set, consisting of a single tank, backplate, harness, wing, and long hose regulator system, and a jacket-style system that is most common in recreational diving. The comparison covers general components and goes into detail about streamlining, fit, and function; weighting options; managing out-of-gas situations in the two regulator configurations; and offers some advice for GUE-trained recreational divers.

5. A New Look at In-Water Recompression (IWR)

What is your best option if you or a team-mate get bent at a remote diving location, that is more than two hours from a chamber? If you are prepared—that means having the right equipment and know-how—the new consensus among the hyperbaric docs is to treat with In-Water Recompression (IWR).

6. High-Pressure Problems: Pulmonary Edema in Technical Divers 

Photo by Jesper Kjoller.

If you don’t know much about immersion pulmonary edema (IPE) have a read! This not-well-understood disorder is on the rise and can not only effect tech divers, but seriously ruin your day if you’re unaware and unprepared to deal with it. DAN. Tekkie Reilly Fogarty has the deets!

7. No-Fault DCI? The Story of My Wife’s PFO After She Kept Getting Bent

Breathing O2

What does it mean if you keep getting bent, even when you follow all the rules? Avid tech diver James Fraser recounts his and his wife’s Deana journey of discovery that led them to realize she had a PFO. Does any of this sound familiar? Read on!

8. How Record-Breaking Scuba Dives are Hurting our Sport

The recent death of 41-year-old technical diver, Sebastian Marczewski, aka “Iron Diver,”
during a failed attempted world record scuba dive to 333 m/1093 ft in Lake Garda, Italy, highlighted the dangers of deep diving record-setting. The tragedy occurred just after GUE instructor Dimitris Fifis had penned an opinion piece for InDepth exploring the nature and motivation of deep diving record-setting. Fifis explained that he wrote the post in order to get a better personal understanding of what motivates divers to set deep diving records. His post was motivated in part by the deaths of two other technical divers attempting deep records. Here are his thoughts and suggestions.

9. Density Discords: Understanding and Applying Gas Density Research 

Photo by Derk Remmers.

Do you know the density of your breathing gas at your planned working depth? New research conducted by Gavin Anthony and Simon J. Mitchell suggests that you better! A gas density of 6 grams/liter (g/l)—the equivalent of diving nitrox 32 at 110 ft/34 m, or trimix 18/35 at 200 ft/61 m—significantly increased the risk of dangerous CO2 retention, resulting in test subjects experiencing problems at three times the rate of divers using gas even 1 g/l less dense. Divers Alert Network risk mitigation leader Reilly Fogarty explains.

10. Incident Report: Lost in a Cave

Photo by Kirill Egorov.

How could four experienced divers get lost in a cave? Human nature got in the way. Human factors pundit Gareth Lock analyzes the factors that led to this “Oh S***” moment and how they might apply to your diving; they are much more common than you think.

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A Message From GUE’s President During These Challenging Times

GUE President, Jarrod Jablonski extends well wishes and informs community of how COVID will affect GUE.

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News from GUE HQ

I would like to offer my wishes for your safety and health during these challenging times. With most of the world heavily affected by the COVID-19 virus, I want to reiterate GUE’s sense of community and offer our wishes that each of you are able to minimize the impact of these difficult days. 

Given the many complications, we are monitoring the virus progression and global health recommendations on a daily basis. Given the variability of restrictions and diversity of exposure risk across the world, GUE is not currently prohibiting dive training. However, we do suggest that each person take their personal situation into account and act  based upon local rules, policies and implemented preventive measures. We urge you to consider the wellbeing and health of all involved. We are in direct communication with our instructors and working with them in support of class policies and training options that reduce transmission risk among those who remain desirous of undertaking training.

GUE divers wishing to postpone their training will receive an automatic extension to their registration grace period, allowing them to repurpose this fee to account for the time lost during the management of the virus. GUE will also extend the normal provisional window, allowing all students an opportunity to upgrade after the threat from the virus has receded. Your GUE instructor will work directly with you toward scheduling a new class and repurposing any deposits or fees paid for training. Please manage those costs directly with your instructor.

Please do contact us directly at info@gue.com if you have any questions. 

In the meantime please accept our heartfelt wishes for your well being. May you and yours remain safe and healthy.

Sincerely,

Jarrod Jablonski


Jarrod is an avid explorer, researcher, author, and instructor who teaches and dives in oceans and caves around the world. Trained as a geologist, Jarrod is the founder and president of GUE and CEO of Halcyon and Extreme Exposure while remaining active in conservation, exploration, and filming projects worldwide. His explorations regularly place him in the most remote locations in the world, including numerous world record cave dives with total immersions near 30 hours. Jarrod is also an author with dozens of publications, including three books.

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