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Semi-Closed Rebreather in worldwide: 8 dive centres on TecDiveTools, with agencies, courses taught and a summary of what students say.
TecDiveTools lists 8 dive centres teaching Semi-Closed Rebreather 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). 5 of these 8 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, 4 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.
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About the course
CORRECTED TIER: This is a diver-level course, not instructor trainer. Semi-Closed Rebreathers (SCR) sit between open circuit and full CCR—they recirculate breathing gas but bleed off controlled portions rather than actively managing oxygen. Entry-level rebreather certification covering unit-specific operation, pre-dive checks, and no-decompression diving. Usually a diver's first rebreather step before CCR training.
Minimum dives vary by unit: Draeger 4 dives/100 minutes; Submatix ST100 5 dives/125 minutes; Azimuth 6 dives/150 minutes; Scuba Force SFX 6 dives/180 minutes. Maximum depth 40m/130ft, no decompression. Graduates qualified for no-decompression SCR diving with nitrox mixes.
8 dive centres on TecDiveTools teach TDI Semi-Closed Rebreather worldwide: United States (5), Indonesia (1), Mexico (1) and Thailand (1). Each is listed above.