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). 96 of these 237 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, 85 have a written synthesis of what reviewers say about them. How we read and count reviews.

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Listings: 237 instructors
Where they are: Dahab (34), Southeast Florida (18), North Florida Cave Country (16), Hurghada (13), Playa del Carmen (13)
Agencies taught: TDI (237), IANTD (14), PADI TecRec (6), NSS-CDS (6), SSI XR (6)
Most taught: Extended Range (237), Advanced Nitrox (236), Decompression Procedures (236), Intro to Tech (200), TDI Sidemount (174), Trimix (159)
Rebreather support: 100 list rebreather units

By country

What is TDI Extended Range?

Extended Range pushes staged decompression diving further than the base Decompression Procedures course, requiring dives past 33m/100ft with at least 2 dives deeper than 40m/130ft on a single decompression gas. It teaches more advanced gas planning, longer runtimes, and the added risk management that comes with deeper no-mistakes diving. It's aimed at divers who've already got Decompression Procedures under their belt and want to extend their working depth before moving into trimix. It sits between Decompression Procedures and Trimix Diver in TDI's technical progression — the natural next step once a diver is comfortable running shorter deco dives. It's open-circuit diving with doubles or sidemount and a dedicated decompression gas, and it opens the door to Advanced Trimix and deeper wreck/cave specialties.

Certifying agency

TDI

Tier

Extended Range · to 55 m

Before you can enrol

TDI Advanced Nitrox Diver and Decompression Procedures Diver certifications, minimum 100 logged dives, minimum age 18.

Common questions about TDI Extended Range worldwide

Where can I take TDI Extended Range worldwide?

237 instructors on TecDiveTools teach TDI Extended Range worldwide: Egypt (65), Philippines (48), United States (42), Mexico (27), Thailand (21) and Indonesia (17), and 1 more. Each is listed above.

How much does TDI Extended Range cost worldwide?

Published prices for TDI Extended Range worldwide range across 22 centres in the TecDiveTools directory — roughly US$600 to US$1,600 at current exchange rates. In each centre's own currency: €550–€850 (8 centres), THB 25,000–44,900 (6 centres), IDR 12,500,000–20,700,000 (4 centres), $950–$1,600 (3 centres) and ₱54,000 (1 centre). 3 centres charge 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.

All prices for TDI Extended Range

How long does TDI Extended Range take worldwide?

Between 3 and 6 days, based on the durations 14 centres publish for it worldwide. 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.

Is there an equivalent of TDI Extended Range from another agency worldwide?

At the same tier in TecDiveTools' cross-agency comparison, instructors worldwide also teach IANTD Technical Diver (71), RAID Advanced Decompression (7), RAID Extended Decompression (5) and PADI TecRec Tec 50 (4). They are comparable rather than interchangeable — each agency sets its own standards and card, so check which one your next course accepts.