Semi-Closed Rebreather
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.
Prerequisites
Minimum age 18 (15 with parental consent); TDI Nitrox Diver or equivalent (may be combined into same program).
Standards
What a diver must demonstrate to pass this course — not always published by the certifying agency.
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.
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 TDI Semi-Closed Rebreather
What are the prerequisites for TDI Semi-Closed Rebreather?
TDI's standards require: Minimum age 18 (15 with parental consent); TDI Nitrox Diver or equivalent (may be combined into same program).
What is the minimum age for TDI Semi-Closed Rebreather?
TDI's standards state: Minimum age 18 (15 with parental consent).
How deep can you dive with TDI Semi-Closed Rebreather?
TDI's standards for TDI Semi-Closed Rebreather set a maximum depth of 40 m.
What does TDI Semi-Closed Rebreather training involve?
According to TDI's published standards: 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.
Where can I take TDI Semi-Closed Rebreather?
8 dive centres and 14 instructors in the TecDiveTools directory teach TDI Semi-Closed Rebreather, in the United States, Indonesia, Mexico and Thailand. Each is listed further up this page.