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Nathan Fillion, the diver.
Nathan has a wonderful character, does not take himself seriously and it is down to earth. I really enjoyed this wonderful conversation.
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Interconnected tissues in decompression model
Multi-Exponential washout models. How to measure risk? DCS risk is intrinsically probabilistic and, not deterministic, in other words, there is no mathematical critical point in which you “can or can’t” get DCS. The risk changes continuously and gradually with decompression stress. Deterministic models work with compartments and base the decompression on a leading compartment in…
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Ratio Deco 1:2 with 2 Decompression bottles
Standardized Gas Mixes: Setpoint Table Depth (meters) Time (minutes) 51 (BT x 2) -15 54 (BT x 2) -10 57 (BT x 2) -5 60 1:2= BT x 2 (setpoint) 63 (BT x 2) +5 66 (BT x 2) +10 69 (BT x 2) +15 72 (BT x 2) +20 Deep stop 0~59 minutes of…
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The RF4 Program and Proceedings
The RF4 scientific program committee consists of Drs. John Clarke, Simon Mitchell, Neal Pollock, Frauke Tillmans, and journalist Michael Menduno. The four primary focal areas are diving safety, physiology, technology, and training. Proceedings of the meeting will be published and made publicly available. Do you know who they are? Check these interviews Save The Dates…
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First stop, which one?
Before you continue reading, review this article: Gradient Factors in a Post-Deep Stops World, because this post was inspired by it. In addition, I recommend you read: Gradient Factors and multi-model approach to decompression. What first stop should I use? How should I modify GF to get a better and cleaner decompression? Deep stops are…
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Planning dives with DIVESOFT
DVESOFT has released an application for smartphones, with the app you may plan dives (CCR/OC), make todo lists, register trips and dives, add devices and a checklist for assembling CCR liberty units. As you see, it’s a comprehensive application for DIVESOFT products, especially for liberty CCR(s). Nevertheless, if you only used their Freedom DC, it’s…
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Multi model approach to deco
Support information for Ratio Deco Decompression Procedures There’s a difference between a decompression model and a decompression strategy, one of the best propositions for it is what JP Imbert called a “multi model approach to decompression safety”, another interesting idea is “Ratio Deco.” Both are valid, extremely useful and based on the same principles; but…
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DIVESOFT Freedom Dive Computers
Tech DC advantages I’ve been using Freedom DC for a long time. From my experience, it is the best computers on the market today. I’m telling you this for many reasons: First, this DC is suitable for any type of diving, this means that you may upgrade or buy the firmware you really need, no…
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Amazing what Charlie Roberson has accomplished
On Saturday, December 11, 2021, KUR divers Charlie Roberson and Andy Pitkin explored and surveyed 564 ft of new passage at the bottom of Mt. Doom. Originally explored in 2007, Mt. Doom was the deepest point in the cave at 407 ffw, until deeper sections were explored last season.
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Ratio Deco- Doing the Numbers
Example of Ratio Deco for 45 meters set point. 2 Method discussed. 45- 1:1
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Problem reaching your valves and isolator on your twins/ doubles?
Do the following exercises to improve your movements and possible fix this issue. The world’s population is aging and becoming healthier; therefore, we see more elderly people doing more outdoor activities. Diving is no exception; much of the technical diving community has a middle-age demographic structure. Other factors that contribute to the age range in…
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John Clarke
John R. Clarke, Ph.D. (born November 20, 1945) is an American scientist, private pilot, and author. He served as Scientific Director at the United States Navy Experimental Diving Unit (NEDU). Clarke is recognized as a leading authority on rebreather engineering. He has an extensive academic career in biological and physiological sciences. He is an excellent…
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An effortless way to add weight on my Sidemount rig
Author: Carlos Lander, edited by: Bruce Konefe Normally when I travel, I prefer to use my “Dive Rite – TransPac” sidemount configuration, twin tanks are not always available. My sidemount configuration works great, however, I needed to find a better solution to mount the lead weights, to help perfect my buoyancy/ trim. With a small…
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Balanced Rig and Neutral Buoyancy
Exploratory view of balanced rig and neutral buoyancy. Review of a real scuba diving accident.
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Mermaids are Real
Ancient sailors claimed to witness in deep oceans creatures’ part-human and part-animal. Maps are strewn with strange creatures likes mermaids and mermen.
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Diving Into History with Thailand’s Sira Ploymukda
During the last trip (wreck diving), Siwat Worachananant and Sira Ploymukda took a set of delightful photographs that I want to share with you. Theme: archaeology
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Karlos Simón
El amigo de los tiburones! Conoce la vida de Karlos en la intimidad. En esta amena conversación Karlos revela su amor por los oceanos, su avidez por la aventura y, sus primeros pasos como camarógrafo.
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The Recreational Decompression Diving
SSI new diving program, 2021. Versión en español This year SSI comes with a new course: Decompression Diving. On my view; this course is aim to the recreational market. Is an effort for bringing safety to divers who tends to stay longer, deeper and generally made “deco” with their dive computer with a single cylinder.…
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Reparación de equipos de buceo
Taller de reparación de equipos, ubicados en Caracas. Llena el formulario para contactarme.
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Argonaut Kraken
I came across this website: Vintage Double Hose and it’s fascinating what I learned about scuba vintage equipment. I still use my US Aquarius and Conshelf regulators and, believed me, I didn’t know those were considered vintage. Bryan created the Argonaut Kraken and, according to him, he did it, because he was frustrated for the…
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O’Neil’s Surprise
It was an afternoon routine when I compulsive checked my e-mail; one email captured my interest. I could not believe what I was reading. Someone was making me a gift, a Cochran EMC-20H Dive Computer. At first, I thought it was a joke, someone was jonking my jeter… but I decided to reply and see…
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Tech Deco
This is a good program with a subtle set of variables and characteristics. It’s well suitable for an Open Circuit Diver to use on the field for last minutes review and run different profiles. What is lack is an alternative windows to run second or third dives in the same day.
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An insightful conversation with Anna Kozlova.
A videographer, an adventurer, and a storyteller. Anna is an enthusiastic, experienced diver and underwater videographer with a background in science and additional education in cinematography. Anna has nine years of diving experience, eight of them as technical diver and asunderwater videographer, and more than one thousand logged dives. She has a creative personality, has a natural…
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Cochran Undersea Technology inDepth Magazine
With Michael Menduno’s help I authored this article for GUE’s (Global Underwater Explorers) InDepth blog/magazine. It all has been a labor of love, and we hope you enjoy reading it as much as we enjoyed writing and editing it. As any other article some photographs are left out, not all of them can make it for one reason or another. Below are…
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The value of snorkeling with your kid
Sorkeling will develop in your child not only motor-skills but also will help in the cognitive process that will serve him in the future.
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Resources and tools
Library- Repository: Documents, softwares, scientific publications, etc.
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Andy Fritz
A bold and humble person, highly intelligent with strategic thinking. No doubt that his actions inspire others to dream, learn more and become more… Feed RSS feed on the newsletter Andy Fritz started modifying Russian military rebreathers back in 1997 initially for personal use, but soon enough divers would travel to Thailand to get their rebreathers modernized…
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Pelagian approach to Instant Cell Validation
The second function of the ADV is provide a simple means to verify the accuracy of the oxygen sensors during a dive. As mentioned in the Set up chapter, oxygen sensors are unreliable and your best defense is to check them frequently. Additionally, during the course of a dive, every time the ADV triggers the…
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Yoga props
Sustainable practice Sustainable means that you want to be able to continue doing yoga without injuries. More often than not, people get injured doing Yoga because they forgot to maintain a good posture foundation. Some people do more importance to breathing than how a posture (exercise) is performed. In reality; both are equally important; nonetheless,…
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Dive Computers
A beginner guide What is underneath? Schematics of a Dive Computer Sensors/Clock → Storage Unit ↔ [Control Unit / Arithmetic and Logical Unit]CPU → Output [Display] A dive computer is a device that operated upon collected data, it is an electronic board which does arithmetic and logical operations accordingly with the programmed decompression algorithm and…
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George Bass
Underwater archaeology pioneer George Bass dies at 88 In a storied career spanning decades, the archaeologist led excavations of ancient shipwrecks and inspired a generation of scientific adventurers.
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Ascent Rate: 60ft./min.?
Have you ever asked to your instructor how was calculated/ came-up-with the ascent rate of the tables or computer that you used? Do you think it reflects basic fact of human physiology? Well, the short answer is no. The selection was made by the USA NAVY based on a compromised between work and safety. At…
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Understanding Ratio Deco Air Tables
Before viewing the numbers, first let’s review a few concepts: “ascent strategy” and “overall procedure”. The strategy is the result of a combination of theory and practicality. The procedure accounts for Rock Bottom gas management for safety reasons. The overall procedure is consistent and compatible with all levels of training and depth. So, divers applied…
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The Jason Parker Trilogy
When saving the world is not enough. This part is focus on the intriguing side of being able to write a series, on evolution, on aliens, deep waters, low oxygen environments, life and more… podcast feed Series Middle Waters “A techno science fiction thriller that is grounded in what we know of our physical world,…
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Joints Mobility
Why nobody teaches mobility in scuba? As divers we use a lot of equipment and, swim large distances underwater, plus need to handle situations like maneuvering the manifold, valves, cameras, etc. People tend to think that what they needs is a lot of muscles, but generally divers forgot about mobility. Joint Mobility refers to as…
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Michael Menduno: The Journalist within
Michael is a wild- Mustang. He has a resilient attitude and the curiosity of a child. Scientist and journalist never grew up in their curiosity 1, these kinds of characters maintain ignited the flame in their eyes. When you talk to Michael, you can perceive it. Michael has an inquisitive mind, like to explore, investigate, and…
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Bill Stewart
Bill is an enhancer; he understands what needs to be done in the current state of the underwater-world. His love for the Philippines and for the western Pacific Ocean is well known. His passion for photography pushes him to travel the world, not only as an explorer of the underwater world, but also as an explorer…
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John B. Griffith Jr.
A Conversation with a Veteran and a Wiseman It’s difficult to describe John, he is the embodiment of a hero, at the same time a Wiseman and a gentleman. He is veteran, writer and author. He travel the world engagement different cultures and absorbing them. He is an enthusiastic person with a lot to share… please enjoy. Click…
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Ratio Deco or deco on the fly
We’re going to review only some aspects of this system, because this is a merely introduction. So, knowing this, lets get into it. This system is based on a statistical approach to decompression schedule, this mean that you must used a set of standardized gases for a particular range of depth that were chosen for…
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El metabolismo es estúpido: un nuevo modelo sobre la formación de burbuja.
05 Feb 2020 | Michael Menduno Traducción: Carlos Lander La existencia y cantidad de burbujas a nivel vascular esta asociada al síndrome de descompresión o embolia gaseosa (EG). Se teoriza que durante la inmersión, las burbujas se desarrollan a partir de pequeños núcleos ya presentes en las cavidades porosas de los tejidos, comúnmente denominado “micronúcleo”.…
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Poseidon Head made by Underwater Technologies
The Configuration of the head has the possibility to use up to three oxygen cells, two independent power supply sources (battery type: LiPo 18650) and a low-power solenoid Clippard. A discussion about solenoids and Kiss valve: A Kiss valve needs at least between 12-13 bar of pressure to works correctly, Clippart works with a very…
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AV-Underwater Technologies-reseña
Ordenador de buceo AV Underwater Technologies. Reseña y Cabezal para poseidon MKVI
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Oh Deco, oh Doppler, O’dive: Evaluando la primera herramienta de seguridad para “deco” conocida
Traducido por: Carlos Lander Título Original: Oh Deco, Oh Doppler, O’Dive: Assessing the World’s First Personal Deco Safety Tool- By Michael Menduno Traducido por: Carlos Lander Título Original: Oh Deco, Oh Doppler, O’Dive: Assessing the World’s First Personal Deco Safety Tool- By Michael Menduno Originalmente publicado por: InDepth en Julio de 2020 Disclaimer: Translations between languages…
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How to replace a solenoid from your Poseidon eCCR
Discussion about solenoid replacement on the MKVI eCCR
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El nuevo orden impuesto
Publicado originalmente el día 18 de Mayo de 2020 COVID-19 Más allá si el virus es natural y trasmitido al ser humano desde un pangolín o, se escapó de un laboratorio en Wuhan o fue creado y esparcido a propósito como parte de una guerra económica, son interrogantes que están latentes en la imagen colectiva.…
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Bill Hamilton interview
Please take the time to review this wonderful article wrote by Joel Silverstein about Bill It’s safe to say that if it weren’t for Bill Hamilton, technical diving as we now know it would not exist. An underwater physiologist with deep roots in the commercial and scientific diving industries, in the late 1980’s he suddenly…
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The concepts behind bubble mechanics and some ideas
This section is based on Dan Reinders presentation on The Varying Permeability Model which you can find free on our library or at Decompression.org How Gas diffuses from bubbles: Look at the process: Understanding how bubbles grow What other effects does Surfactant have? CHANGING CONCEPTS IN DECOMPRESSION Jean Pierre Imbert – Solving the mystery of…
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Understanding nucleation as a process and what divers can do to mitigate it.
Divers have a generalized concept that decompression bubbles form with ascent and reduced its sizes with a decrease in ambient pressure but this isn’t completely accurate, tiny microbubbles are already present prior depressurization. Which means that two factors should be present for the occurrence of DCS, micronuclei and supersaturation. Although our internal body have no…
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The brain behind FATHOM Dive Systems
Charlie Roberson FATHOM Dive Systems is a manufacturing company that focuses on life-support equipment for underwater exploration. Charlie is the brainchild of FATHOM, a cave diver and explorer, who sought to make products for his own exploration. The company’s goal is to produce innovative, functional, and reliable equipment for underwater exploration. Link to the Podcast…
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Ultrasound devices and DCS subclinical gas phase
Ultrasound devices make it possible to detect subclinical bubbles, the most common Doppler ultrasonic bubble detector. The use of this devices make possible to developed the concept of silent bubbles. It was demonstrated that decompression free of signs and symptoms in both human and animals could actually produce a gas phase. This clearly shows that there…
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Vacante de presión parcial y el modelo metabólico estático- II parte
Vacante de presión parcial del oxígeno y el modelo metabólico estático- II parte
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El metabolismo es estúpido: un nuevo modelo sobre la formación de burbuja.
05 Feb 2020 | Michael Menduno Traducción: Carlos Lander El artículo esta dividido en dos partes, sin embargo, el original no. La existencia y cantidad de burbujas a nivel vascular esta asociada al síndrome de descompresión o embolia gaseosa (EG). Se teoriza que durante la inmersión, las burbujas se desarrollan a partir de pequeños núcleos…
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MK29 rebreather
Recently I spoke with John Clarke, on our conversation he mentioned that the NAVY is working on a CCR that could be used with umbilical as a backup; so if you still pondering about it, below are public-videos explaining the concept
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Inflammatory responses: Compartmental versus Ratio Deco.
Understanding the conclusion of a comparative evaluation of two decompression procedures for technical diving using inflammatory responses: Compartmental versus Ratio Deco.
Diveimmersion.org 