Dive Directory
Loading dive centres and instructors…
Loading dive centres and instructors…
Advanced Trimix in the United States: 20 dive centres on TecDiveTools, with agencies, courses taught and a summary of what students say. 3 publish course prices.
TecDiveTools lists 20 dive centres teaching Advanced Trimix in the United States. 3 of them publish course prices, in the currency the shop advertises and with the date each was checked — not converted, and not estimated.
Listings are ordered by how much evidence exists about their technical diving, not by a star rating, with any paid Featured listing shown first and marked as such (how rankings work). 14 of these 20 carry reviews we have read and classified as being about technical or overhead training. The count excludes recreational certifications by name, so a busy resort does not outrank a one-instructor cave operation on the volume of its reef trips. Separately, 11 have at least one instructor whose reviews we have read and summarised — a dive centre carries no synthesis of its own. How we read and count reviews.
Looking for individual instructors instead? Instructors in United States.
About the course
Advanced technical diving course extending trimix diving into hypoxic gas territory at depths exceeding 70m/230ft. Teaches hypoxic gas planning, extended decompression management with multiple gases, and equipment redundancy required at extreme depths. Represents the top of open-circuit depth progression before rebreather training.
Minimum 4 dives with 100 minutes accumulated bottom time. At least 2 dives deeper than 70m/230ft. In-water skills: gas management at extreme depth, multi-stage decompression execution, buoyancy control at pressure, emergency procedures with stage cylinders. Competency in hypoxic gas calculations and extended decompression gas switching.
The centres listed above teach TDI Advanced Trimix in United States. Requirements are set by the agency, not the centre, so they are the same wherever you train — what differs is price, class size and how much diving is included.
20 dive centres on TecDiveTools teach TDI Advanced Trimix in the United States: Southeast Florida (8), North Florida Cave Country (6), Florida West Coast (Tampa Bay) (3), Florida Keys (2) and Florida Panhandle (1). Each is listed above.
Deep training usually means offshore wrecks — the Spiegel Grove and Bibb at around 40 m off Key Largo, and the USS Oriskany, whose flight deck at about 43 m and sand at about 65 m take you into trimix territory.
One centre in the TecDiveTools directory publishes a whole-course price for TDI Advanced Trimix in the United States: Horizon Divers, at $2,400. 1 centre charges by the day instead, which is not comparable with a course total. Prices differ mainly in what they include, so compare the inclusions before comparing the numbers. Prices were last checked in September 2026.
4 days, based on the durations 1 centre publishes for it in the United States. The time depends on the centre's schedule, weather, and how quickly the required skills are demonstrated — agencies set a minimum number of dives, not a fixed number of days.
At the same tier in TecDiveTools' cross-agency comparison, dive centres in the United States also teach IANTD Trimix Diver (5). They are comparable rather than interchangeable — each agency sets its own standards and card, so check which one your next course accepts.