Fathom Gemini CCR – Houston’s Expedition & Trimix Choice

From Air Diluent to Normoxic Trimix: Master the Gemini at Gulf Coast Scuba

The Fathom Gemini is a mechanical CCR (mCCR) designed for divers who demand rugged simplicity and a clutter-free profile. Whether you are navigating tight cave restrictions or exploring deep Gulf wrecks, the Gemini’s "split scrubber" design and manual control offer unmatched reliability.

At Gulf Coast Scuba, we provide the complete training path for the Gemini. We specialize in taking divers from their initial CCR Air Diluent certification all the way through Normoxic Trimix, ensuring you have the skills to "fly the needle" with precision at any depth.

The Gemini Advantage

• Needle Valve Precision: The 316 Stainless Steel Swagelok needle valve gives you manual, granular control over your oxygen addition—perfect for maintaining rock-solid setpoints during deep Trimix missions.

• The Ultimate Travel Unit: Weighing only 20.2 lbs, the Gemini is built for the global explorer. It fits easily into travel luggage without sacrificing the 5-hour scrubber duration.

• Thermal Efficiency: The canisters are made of Black Amalgon, which insulates 400x better than aluminum. This keeps your scrubber reaction warm and efficient, a critical factor for the long decompression stops required in Normoxic diving.

• Effortless Breathing: Back-mounted counterlungs provide a superior Work of Breathing (WOB), keeping you comfortable and reducing CO2​ buildup even at the 200ft limit.

Your Gemini Training Path in Houston

We offer a seamless, step-by-step curriculum for the Gemini platform:

• IANTD Gemini CCR Air Diluent: The foundation. Master buoyancy, trim, and manual gas addition (mCCR) fundamentals.

• IANTD Gemini Air Diluent Decompression: Learn to manage staged decompression while maintaining the loop.

• IANTD Gemini Normoxic Trimix: The "Clear Head" course. Use Helium to eliminate narcosis and extend your range to 200 fsw (60 msw).