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Cavern Instructors Worldwide
Cavern in worldwide: 193 instructors on TecDiveTools, with the agencies and courses each teaches, and a summary of what students say.
193 instructors
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Cavern in worldwide: 193 instructors on TecDiveTools, with the agencies and courses each teaches, and a summary of what students say.
TecDiveTools lists 193 instructors teaching Cavern worldwide.
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). 90 of these 193 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, 83 have a written synthesis of what reviewers say about them. How we read and count reviews.
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About the course
Cavern is the entry-level overhead-environment course, limited to the cavern zone — within sight of natural light and a direct exit — rather than a true cave. It introduces line use, buoyancy control, and the discipline of moving through an overhead space before a diver commits to real cave training. It's for open-water divers curious about overhead diving, or planning to progress into Intro to Cave and Full Cave, who need the foundational skills first. It's deliberately conservative — TDI keeps cavern divers within reach of natural light specifically so the stakes of a mistake stay low while the fundamentals are learned. No fixed depth beyond the cavern light-zone limit; 4 dives and 80 minutes of accumulated bottom time at 2 different sites required.
193 instructors on TecDiveTools teach TDI Cavern worldwide: Mexico (93), United States (57), Thailand (20), Indonesia (10), Philippines (7) and Malta (6). Each is listed above.
Published prices for TDI Cavern worldwide range across 9 centres in the TecDiveTools directory — roughly US$500 to US$1,350 at current exchange rates. In each centre's own currency: $600–$1,320 (4 centres), THB 20,000–35,000 (3 centres) and MX$9,500–MX$15,000 (2 centres). 9 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.
Between 2 and 5 days, based on the durations 17 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.
At the same tier in TecDiveTools' cross-agency comparison, instructors worldwide also teach IANTD Cavern Diver (73), RAID Cavern (5), NSS-CDS Cavern Tech Diver (4), NSS-CDS Single Tank Cavern Diver (4) and ANDI Cavern (2). They are comparable rather than interchangeable — each agency sets its own standards and card, so check which one your next course accepts.
