A technical diver handling decompression stage cylinders during a dive

Photo by Teemu Virtanen · CC BY-SA 3.0

OC TechIANTD

Recreational Trimix Diver

Official course standards ↗Last updated September 7, 2026

Entry-level technical mixed-gas diving on open circuit to 132 fsw (40 msw), using trimix to manage nitrogen narcosis at intermediate depths. Teaches basic trimix theory, gas blending, single-gas-switch decompression, and no-stop diving within recreational depth limits using Equivalent Narcotic Depths (END) no greater than 100 fsw. This foundation opens technical diving progressions into deep technical, cave, and wreck specializations.

Prerequisites

IANTD Deep Diver or equivalent; IANTD EANx Diver or equivalent; minimum 15 logged dives; minimum 15 years old (with parental approval) or 18 years old independently

Standards

What a diver must demonstrate to pass this course — not always published by the certifying agency.

Basic trimix theory and gas blending, Equivalent Narcotic Depth (END) calculations and management, single-gas-switch decompression procedures, setpoint and oxygen toxicity awareness on trimix, emergency procedures for trimix diving

Instructors Teaching This Course

Dive Centres Offering This Course

We're still building out the directory country by country, so this list isn't every instructor or dive centre teaching it in the world — more locations are coming soon.

Common questions about IANTD Recreational Trimix Diver

What are the prerequisites for IANTD Recreational Trimix Diver?

IANTD's standards require: IANTD Deep Diver or equivalent; IANTD EANx Diver or equivalent; minimum 15 logged dives; minimum 15 years old (with parental approval) or 18 years old independently.

What is the minimum age for IANTD Recreational Trimix Diver?

IANTD's standards state: Minimum 15 years old (with parental approval) or 18 years old independently.

How many dives do I need before starting IANTD Recreational Trimix Diver?

IANTD's standards state: Minimum 15 logged dives.

What does IANTD Recreational Trimix Diver training involve?

According to IANTD's published standards: Basic trimix theory and gas blending, Equivalent Narcotic Depth (END) calculations and management, single-gas-switch decompression procedures, setpoint and oxygen toxicity awareness on trimix, emergency procedures for trimix diving.

Where can I take IANTD Recreational Trimix Diver?

17 dive centres and 32 instructors in the TecDiveTools directory teach IANTD Recreational Trimix Diver, in Mexico and the United States. Each is listed further up this page.