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TDI · Overhead intro
Cavern Diver
Your first step into overhead environments, within the daylight zone.
Overview
Cavern Diver introduces overhead diving within the natural light zone, with strict penetration and depth limits. You learn guideline use, anti-silting technique and the conservative mindset overhead diving demands.
What you'll learn
- Guideline running and reel use
- Anti-silt propulsion
- Overhead gas rules
- Light and communication procedures
What's included
- All academic sessions and instructor time
- TDI digital materials and certification registration
- Use of stage/technical rig and required gas fills
- Open-water training dives in Lake Okanagan
Prerequisites
SDI Advanced Adventure Diver + 40 logged dives (or equivalent), age 18+.
Configuration matters here. Sidemount or backmount doubles? Take our gear guide for a recommendation, or see the kit list below.
Kit for this course
Recommended gear
The configuration we'd dive for this course, tap any card to drill into products, or shop it as a ready-made bundle. Not sure what suits you? Take the gear guide →
Sidemount
- Dedicated sidemount harness + wing
- Two independent cylinders, regulators and SPGs
- Streamlined hose routing
- Cutting tool and SMB
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Add-onCave / overhead
- Primary canister light + two backups
- Primary and safety reels, spools
- Line arrows and cookies (markers)
- Full redundancy, no direct ascent
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Add-onCold-water (dry suit)
- Dry suit + appropriate undergarment
- Dry or wet gloves
- Dedicated dry-suit inflation hose
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