Deep Dive into Reading

Category: Scientific, Archaeology and Public Safety Diving

  • Interconnected tissues in decompression model

    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…

  • Ratio Deco 1:2 with 2 Decompression bottles

    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…

  • The RF4 Program and Proceedings

    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…

  • Planning dives with DIVESOFT

    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…

  • Multi model approach to deco

    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…

  • Is Chichiriviche endangered?

    Is Chichiriviche endangered?

    Chichiriviche is a small town located in la Guaria. The entire town’s population livelihood dependes on two economic activities, fishing, and diving tourism. Consequently, the state of the coral reef is paramount in development for both businesses. The mear existence of the town causes pressure over the reef, but not so much as the externalities…

  • Does Coral Reef have a price?

    Does Coral Reef have a price?

    We managed to navigate the world based on a value system that classified and set hierarchies. This structure is embedded in us to a point that our society ethics that govern our behavior are called core values. But why is this concept important and what relationship does it have with Coral Reef? Understanding how humans…

  • Search line in PSD

    Search line in PSD

    Despite some debate over the best way to manage a search line, the consensus is attaching a diver to a search line by a harness or BCD. Mark Philips authored an article for PSDiver Magazine in which he described how to secure the diver by a tether line. This safety line is the most secure…



    Are you an instructor? This article is a must read. The problems aroused during any immersion (open water or not) are not always easy to identify. Being an instructor is a huge responsibility, sometimes, the public do not comprehend the complexity of this sport. It’s imperative that everyone should be checked by a physician prior…

  • Amazing what Charlie Roberson has accomplished

    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.

  • Ratio Deco- Doing the Numbers

    Ratio Deco- Doing the Numbers

    Example of Ratio Deco for 45 meters set point. 2 Method discussed. 45- 1:1

  • Rebreather Setting Leads to Dangerous Equipment Failure

    Rebreather Setting Leads to Dangerous Equipment Failure

    that gear is used for. Servicing for regulators varies on the brand and type of equipment, so making sure the technician knows if it will be used on a close-circuit rebreather could have prevented an irregular pressure setting. It is always best before diving to double check your apparatus and check your line pressures to…

  • Diving Into History with Thailand’s Sira Ploymukda

    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

  • Mike Anghera, Diving Safety Officer

    Mike Anghera, Diving Safety Officer

    Mike Anghera Interview The UCLA Scientific Diving Program provides training, logistics and support for faculty, staff and student reseachers at UCLA. All diving policies and procedures are based on the diving standards set forth by the UC Los Angeles Diving Control Board and the American Association of Underwater Scientists. All research diving projects and divers…

  • Resources and tools

    Resources and tools

    Library- Repository: Documents, softwares, scientific publications, etc.

  • Andy Fritz

    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…

  • Pelagian approach to Instant Cell Validation

    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…

  • Dive Computers

    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…

  • Ascent Rate: 60ft./min.?

    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…

  • Understanding Ratio Deco Air Tables

    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…

  • The Jason Parker Trilogy

    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,…

  • Bill Stewart

    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…

  • John B. Griffith Jr.

    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…

  • Ratio Deco or deco on the fly

    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…

  • How to replace a solenoid from your Poseidon eCCR

    How to replace a solenoid from your Poseidon eCCR

    Discussion about solenoid replacement on the MKVI eCCR

  • Bill Hamilton interview

    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…

  • The concepts behind bubble mechanics and some ideas

    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 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…

  • Understanding nucleation as a process and what divers can do to mitigate it.

    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…

  • The brain behind FATHOM Dive Systems

    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…

  • Ultrasound devices and DCS subclinical gas phase

    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…

  • MK29 rebreather

    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

  • Inflammatory responses: Compartmental versus Ratio Deco.

    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.

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