Samaesan Hole
หลุมแสมสาร
The Abyss
A legendary 85–100m deep sinkhole in the Gulf of Thailand — one of Southeast Asia's most extreme technical diving sites.
Depth Range
85–100m
Site Type
pinnacle
Samae San
Visibility
2–10m at depth
20–27°C (cold thermocline]
Getting There
30 min boat from Samae San
Near Samae San islands
Marine Life
Notable Features
- • 85–100m deep sinkhole
- • Extreme technical dive
- • Deepest point in Gulf of Thailand
- • Collapsed cave system
Best Time to Visit
About Samaesan Hole
The Samaesan Hole is a natural underwater sinkhole plunging to approximately 85–100m depth in the middle of the Gulf. It's one of the deepest accessible points in Thai waters and a pilgrimage site for technical divers using trimix and rebreathers. The hole is believed to be a collapsed cave system. Conditions are challenging with cold thermoclines, poor visibility at depth, and strong currents. This is NOT a recreational dive — it requires extensive technical diving training and experience.
Tips
Trimix/rebreather certification required. Only for highly experienced technical divers. Multiple fatalities have occurred here.
Experience Required
Full technical diving certification. Trimix or rebreather trained. NOT recreational.
Location
GPS: 12.5500°N, 100.9700°E