I am a beginning trimix diver. Oliver Robertson was wonderful. His advice on gas planning was right on the mark, and the entire trip was outstanding. We dove to 210 feet on Santa Rosa wall on TMx 19/40, and Palancar on air to 165, using Nitrox for deco, with the O2 fraction depending on how deep the top of the reef was at our planned ascent. Oliver is a fantastic instructor, gas blender, and guide at a reasonable price. If you want to dive in Cozumel, but you don't want to do 25-minute no-stop cattleboat diving, give Oliver a call.
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