Dive-site story
Thale Song Hong is a deep, flooded karst sinkhole situated in southern Thailand. Widely recognized as one of the premier technical diving proving grounds in Southeast Asia, the lake features steep underwater walls that plunge into an extensive, dark cavern system. In the sunlit shallows, submerged logs and freshwater vegetation fringe the rim, while the bottom drops steeply into deep overhead environments requiring rigorous cave and trimix protocols.
Steep limestone sinkhole walls plunging into profound depths
Premier freshwater training site for extended-range and trimix divers
Submerged timber formations and quiet freshwater shallows along the perimeter
Access to extensive submerged cave passages for qualified overhead divers
Location
Use the map to plan with your operator and confirm the exact entry point on the day.
Seasonality
The dry season provides the clearest surface conditions and minimizes runoff into the sinkhole.
Marine life
| Species | Likelihood | J | F | M | A | M | J | J | A | S | O | N | D |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Striped SnakeheadChanna striata | Common | ||||||||||||
| TilapiaOreochromis niloticus | Common | ||||||||||||
| Freshwater Crab | Seasonal | ||||||||||||
| Asian Swamp EelMonopterus albus | Rare |
Marine forecast
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