Drift Diving in Thailand — Current-Swept Sites & Techniques

Top drift dive sites in Thailand:

Richelieu Rock: When current hits this horseshoe pinnacle, plankton concentrates in the sheltered bay, attracting massive aggregations of fish — and the predators that follow them. Drift along the outer wall, duck into the horseshoe to shelter, then ride the current around the other side. Currents can change direction mid-dive. This is Thailand's most dynamic drift dive.

Koh Bon (Similans): The west ridge at Koh Bon channels current beautifully. Drift along the wall at 15–25 meters watching grey reef sharks and schools of trevally hunting in the current. Manta rays at the cleaning station often hover into the current, making for spectacular drift-by encounters.

Hin Daeng South Wall: When current runs along the wall, the experience is electric — soft corals extend fully, fusiliers stream past in dense schools, and mantas glide effortlessly through the current. The wall provides orientation, making this one of the more manageable strong-current dives.

Chumphon Pinnacle (Gulf): Currents here can be surprisingly strong, sweeping between the granite boulders at 14–36 meters. Bull sharks at depth and enormous barracuda schools make current days the most exciting time to dive this site.

Sail Rock (Gulf): Moderate currents enhance the schooling fish experience. Batfish, barracuda, and trevally are more active in current. The chimney should be avoided in strong current — buoyancy control becomes more challenging.

Drift diving techniques:

1. SMB deployment: Mandatory on all drift dives. Deploy at the start of your ascent so the boat can track you. Practice deploying an SMB in current before attempting it on a real drift dive. Carry a reel (not a spool) with at least 20 meters of line.

2. Negative entries: On current days, boats cannot hold position. Giant stride, deflate, and descend immediately to the dive depth. Hesitation on the surface means you drift away from the site before reaching depth. Your guide will brief the descent point.

3. Streamlining: Tuck gauges, secure hoses, nothing dangles. In current, anything loose creates drag and can snag on coral. Streamlined divers use less air and have better control.

4. Using reef structure: When current is strong, use rocks and coral heads as shelter to pause, observe, and manage your air. Move between sheltered spots rather than fighting the current continuously.

5. Group management: Stay together. In drift dives, separated divers can end up hundreds of meters apart. Maintain visual contact with your buddy and guide. If separated, deploy SMB and ascend — the boat will collect you.

6. Current reading: Watch soft corals — they point in the current direction. Watch fish — they face into the current. Feel the current on exposed skin. Adjust your dive plan based on what you observe at depth.

Advanced divers comfortable with currents who want high-energy dive experiences. Pelagic wildlife enthusiasts — currents attract the big stuff. Photographers seeking active marine life scenes. Divers progressing beyond calm-water diving. Not for beginners or divers uncomfortable in moving water.

November–May for Andaman drift sites. Current strength varies with tides and season — full moon and new moon periods often bring stronger currents. Gulf drift dives (Chumphon Pinnacle, Sail Rock) are available year-round but current is most reliable March–September.