PDR 3.0: POD DIVER RADIO

The Philosophy of Technical Dive Instruction: a discussion In this episode of Pod Diver Radio, host Joe Cocozza sits down with James and Marissa from Hidden Worlds Diving to dig into the philosophy behind modern technical and cave diver training. This isn't a gear-review show—it's a deep dive into how tech divers are made, not just certified. From their early days learning directly from the pioneers of technical diving to running a busy cave and rebreather operation in North Florida, James and Marissa share why true mastery can't be crammed into a 3-day checklist course. They break down mentoring vs. minimal standards, what "skill mastery" should really look like, and why environment-specific training in high-flow Florida caves is a completely different animal than blue-water decompression dives. You'll hear candid stories about gas-switch failures, sidemount setups that almost ended up in the closet forever, and why hiring a local guide or instructor can save you both money and misery. The team also tackles cave etiquette, conservation, and how over-extending mainlines and dumbing down dives can actually hurt the next generation of tech divers. If you're a wreck or tech diver thinking about going overhead—or you're already in cave country and wondering how to choose the right instructor—this episode will give you a brutally honest roadmap. Tags (SEO / tech-diver focused): technical diving training cave diving instruction Florida cave diving sidemount configuration NAUI technical diving rebreather and trimix training Ginnie Springs cave diving Hidden Worlds Diving

Interview with Shawn Clark about how he overcame the challenges of Cave Diving when he only has one leg.

TRAINING on the OPTIMA CM: Chest Mounted CCR: PART-2 Training report on the CM w/ Lamar Hires of Dive Rite. On location at Blue Grotto Dive resort in Williston FL. For more info check out: https://www.diverite.com/products/uncategorized/o2ptima-cm/ To join the Optima CM Facebook group: https://www.facebook.com/groups/267267033283934

TRAINING on the OPTIMA CM: Chest Mounted CCR PART-1 Training report on the CM w/ Jared Hires of Dive Rite. On location at Royal Springs FL. For more info check out: https://www.diverite.com/products/uncategorized/o2ptima-cm/ To join the Optima CM Facebook group: https://www.facebook.com/groups/267267033283934

Underwater Cave Photography Discussion of Underwater Cave Photography with Marissa Eckert of Hidden Worlds Diving. For more info about cave diving instruction or to hire Marissa as an underwater photographer contact her at: - https://www.dive-caves.com/ - 610-310-8210

Sidemount + rebreathers = the modern cave diver's playground. In this episode, Joe sits down with cardiologist, tech instructor, and KISS instructor trainer Dr. Doug Ebersole to unpack the design, history, and real-world use of KISS's two sidemount rebreathers: the Sidekick and the Sidewinder. Doug walks through how the original Sidekick evolved from a semi-closed cave exploration tool into a full CCR, and how a custom project for a double-amputee Marine, Josh Houghtaling, led to the creation of the Sidewinder—now one of the most popular sidemount CCRs in the cave community. You'll hear how each unit is configured, how counterlung placement impacts work of breathing, what's involved in trimming and weighting, and when you might choose a Sidekick over a Sidewinder for extreme restrictions. Doug also shares how some divers use the Sidewinder as a bailout CCR or even convert it into a lightweight "backwinder" for long recreational boat dives. If you're a cave or tech diver eyeing sidemount rebreathers—or trying to decide which KISS chassis matches your mission—this episode will give you a clear, practical comparison from someone who teaches and dives both.

Broadcast from High Springs in the heart of North Florida cave country, this episode of Pod Diver Radio goes deep into cave diving etiquette, culture, and how tech training has changed over the last few decades. Joe sits down with his original cave instructor, Terrence Tysall – now NAUI's Director of Training and VP of Operations, Cambrian Foundation co-founder, former Texas A&M DSO, and long-time explorer. They look back at the early days of cave and trimix diving, mentorship from legends like Tom Mount, Bill Hamilton, and Sheck Exley, and how today's gear and training culture have reshaped who's going into the overhead. Using real recent dives at Ginnie Springs, Little River, and Peacock as case studies, Joe and Terrence break down what good cave etiquette looks like – exits having priority, scooter behavior in the Eye, not dropping on top of someone's deco, and how to interact with open-water divers in caverns without being "that" cave diver. Terrence also tackles bigger questions: – Why are some instructors only tech diving when they're teaching? – How social media and ego are driving Dunning–Kruger in the caves – Why checklists, gas analysis, and old-school line protocols still matter in a high-tech world – Five practical ways we can bring the community spirit back to cave country If you dive caves—or want to—this episode is a reality check on how we treat each other underground and how to keep the culture from devolving as the sport grows.

Interview with Cardiologist Doug Ebersole MD talks about PFOs (Patent Foramen Ovale) which is a suspected risk factor for DCS (Decompression Sickness). PFO is a relatively benign cardiac defect that creates a passage in a wall that normally separates the left and right upper chambers of the heart. PFO is found in about 25 percent of adults. If gas bubbles form after a dive, the venous bloodstream will carry them to the right side of the heart. In divers with PFO, the bubbles could pass through the opening, bypassing the lungs and theoretically putting the diver at an increased risk of decompression sickness (DCS). For info about the study. https://dan.org/alert-diver/article/study-update-pfo/

Sub Surface Ecology in the Underwater Caves of the Rivera Maya Interview with Dr David Brankovits PhD about the cave ecology and the food web in the underwater caves of the Yucatan Peninsula. Dr Brankovits is a Cave Diver and Biogeochemist. In his aquatic cave field work, he has made important discoveries of the food webs of underwater caves. He is currently working at Texas A&M University. Also he an expert in Marina Chemistry and an investigator for Woods Hole Oceanographic Institution. His paper on anchialine fauna from the Yucatan Peninsula, Mexico, can downloaded here: https://checklist.pensoft.net/article/19103/