Together, they explore Bernardo's journey from fixing compressors as a teenager in his family's business to becoming a leading expert on high-pressure systems in the Mexican cave diving capital. They dive deep into the mechanics that keep divers alive, discussing the crucial engineering differences between valve types and the terrifying consequences of equipment negligence. Bernardo bridges the gap between industrial engineering and diving, explaining why knowing what happens inside your tank valve is just as critical as checking your gas.

In this episode, we discuss:

• ​The Valve Wizard's Origin: Growing up in a dive shop, taking over the family business at 18, and blending hands-on mechanics with self-taught engineering.
• ​DIN vs. Yoke: A technical breakdown of why the industry is (and should be) shifting to DIN, including the safety limits of the clamp system versus the captured O-ring design.
• ​The Explosion: A harrowing first-hand account of a filling station accident caused by mismatched threads, highlighting a deadly risk often invisible to the average diver.
• ​Nautec Valves: Why these German valves are considered the gold standard—from lead-free brass alloys to the "non-memory" properties of the internal seats.
• ​The trends that CCR diving is bringing to Mexico and how the businesses adapt to supply it.
• ​The Safety Gap: The lack of formal certification for filling station operators and why "I've always done it this way" is a dangerous mindset in technical diving.
• ​Maintenance: Why your valves need service just as much as your regulators.

About the guest:

Bernardo Rotzinger is a 33 years old Mexican engineer, cave diver and filling station manager who grew up at the Cuzel filling station. His father, the founder of Cuzel, started the business to fulfill a higher standard when back in the 80s it was difficult to find good quality air for divers.

Today, he is one of the most knowledgeable technicians in compressor, filling, tank and valve maintenance in Mexico.

Connect with Bernardo Rotzinger:

• ​Website:

• ​Facebook:

• ​Instagram:

• ​E-mail:

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