Top 10 Technical Diving Sites in Thailand: Open Circuit Focus (2025)
Thailand's Ultimate Tech Diving Guide
As Thailand's premier technical diving specialists focusing exclusively on open circuit systems, TekDive.org brings you the definitive guide to the kingdom's most challenging dive sites. After logging 5,000+ tech dives across Thai waters, our team presents the top 10 sites where open circuit diving excels.
Key Technical Diving Factors
These critical factors determine site selection for open circuit technical diving:
| Factor | Ideal Range | TekDive Recommendation |
|---|---|---|
| Depth Profile | 30-60m | Dual tanks + stage bottles |
| Gas Requirements | Trimix 18/45 to 15/55 | Double-bladder wings |
| Current Conditions | Moderate to Strong | Reef hooks essential |
| Accessibility | Boat-accessible | Minimum 4-hour charters |
The Top 10 Technical Diving Sites
1. King Cruiser Wreck - Phuket
Depth: 18-32m | Gas: Trimix 18/45
Challenge: Complex penetration opportunities with collapsed sections
OC Advantage: Wide swim-throughs perfect for double tanks
Season: November - April
2. Richelieu Rock - Similan Islands
Depth: 5-35m+ | Gas: Trimix 21/35
Challenge: Strong currents attracting pelagics
OC Advantage: Optimal gas management for multi-level profiles
Season: December - March
3. HTMS Sattakut - Koh Tao
Depth: 14-30m | Gas: Nitrox 32
Challenge: Penetration training site
OC Advantage: Ideal for entry-level tech divers
Season: Year-round
4. Koh Bon Pinnacle - Similan Islands
Depth: 15-40m+ | Gas: Trimix 21/35
Challenge: Thermoclines and current surges
OC Advantage: Efficient gas switching at cleaning stations
Season: February - April
5. Chumphon Pinnacle - Koh Tao
Depth: 14-36m | Gas: Trimix 18/45
Challenge: Deep pelagic encounters
OC Advantage: Bubble stream attracts marine life
Season: November - May
6. Hin Daeng & Hin Muang - Koh Lanta
Depth: 5-60m+ | Gas: Trimix 15/55
Challenge: Extreme depth and remote location
OC Advantage: Simple gas management in challenging conditions
Season: October - May
7. Southwest Pinnacle - Similan Islands
Depth: 25-45m+ | Gas: Trimix 18/45
Challenge: Advanced decompression requirements
OC Advantage: Precise gas management for multi-level dives
Season: December - April
8. Kram Wreck - Pattaya
Depth: 30-42m | Gas: Trimix 18/45
Challenge: Deepest accessible wreck in Gulf of Thailand
OC Advantage: Penetration safety with bubble guidance
Season: October - June
9. Sail Rock - Koh Phangan
Depth: 5-40m+ | Gas: Trimix 21/35
Challenge: Vertical chimney descent
OC Advantage: Ideal for vertical gas management practice
Season: Year-round
10. Boonsung Wreck - Similan Islands
Depth: 18-30m | Gas: Nitrox 32
Challenge: Complex debris field navigation
OC Advantage: Extended bottom time with double tanks
Season: December - April
Open Circuit Diving Advantages
At TekDive.org, we specialize in open circuit technical diving for these reasons:
- Simplicity: Easier maintenance and troubleshooting
- Cost-Effectiveness: Lower initial investment and operational costs
- Gas Flexibility: Better adaptation to varying dive profiles
- Safety: Bubble stream provides visual reference for buddies
- Training Efficiency: More straightforward skill development
Ready for Your Technical Diving Adventure?
Book your custom technical diving experience with Thailand's open circuit specialists