Coral reef at koh Tachai information and dive map

Koh Tachai Dive Site

Halfway between the Surin Islands and the Similan Islands, the Koh Tachai dive site is at a small uninhabited island.

The main features of diving here are its submerged pinnacles, large boulders, and excellent wildlife. The top of the reef is built with excellent specimens of hard coral while deeper parts are known to have many boulders, seamounts and sea fans. It’s a good place to spot white tip reef sharks, nurse sharks, manta rays and the king of all marine animals, the whale shark. Other more common species such as large schools of barracuda, Napoleon wrasses, yellow-backed fusiliers, and bannerfish can be found in huge numbers.

All about the dive at Koh Tachai Pinnacle

The Enchanting Koh Tachai Pinnacle: Unveiling Twin Peaks of Underwater Majesty

The Koh Tachai Pinnacle, a celebrated dive site nestled between the Surin Islands and the Similan Islands, goes by various names, including Twin Peaks or The Dome. The site derives its appellations from the two prominent pinnacles that grace its underwater landscape, accompanied by a colossal dome-like granite boulder, standing as the central feature of this mesmerizing dive site.

A Dive into Twin Peaks: Experiencing the Extraordinary

As divers descend into the depths of Koh Tachai Pinnacle, they are greeted by the awe-inspiring sight of not one but two distinct pinnacles. These Twin Peaks, each marked by its unique underwater topography, add a layer of complexity and beauty to the diving experience. The central focal point, a massive dome-shaped granite boulder, becomes a beacon for exploration, drawing divers into a world where large boulders are strategically spread around this central rock, creating intricate swim-throughs, channels, and coral plateaus that are veritable havens for marine life.

Koh Tachai Dive Site Swim-throughs and Channels: Navigating Nature’s Labyrinth

The underwater terrain surrounding the central dome at Koh Tachai Pinnacle is a labyrinth of swim-throughs and channels, where large boulders provide natural passageways for divers to navigate. These formations, crafted by the elements over time, offer a captivating underwater journey as divers weave through the submerged corridors. The play of light and shadow, coupled with the dynamic architecture of the boulders, creates an ethereal ambiance, transforming each swim-through into a cinematic exploration.

Coral Plateaus: Rich Havens of Marine Life

Beyond the captivating swim-throughs and channels, the Koh Tachai Pinnacle unveils coral plateaus that are rich in life. The large boulders create elevated platforms adorned with a spectacular array of coral formations. Hard and soft corals thrive in this underwater oasis, providing shelter and sustenance for a diverse spectrum of marine species. These plateaus become bustling ecosystems, where marine life congregates, adding vibrancy to the already enchanting underwater landscape.

Biodiversity Symphony: Marine Life Flourishing

The rich topography of Koh Tachai Pinnacle fosters a thriving marine ecosystem, making it a sought-after destination for divers seeking encounters with diverse sea life. The swim-throughs and channels become passageways for various fish species, creating a dynamic and interactive underwater environment. Schools of fish, from vibrant reef fish to larger pelagic species, traverse the underwater labyrinth, contributing to the symphony of biodiversity that defines this extraordinary dive site.

A Central Granite Boulder: The Heartbeat of Koh Tachai Pinnacle

At the core of this underwater marvel lies the central granite boulder, an imposing feature that serves as the heartbeat of Koh Tachai Pinnacle. This colossal rock formation becomes a focal point for marine life activity, offering refuge and a distinctive landmark for divers exploring the site. The interplay of light on the granite surface, combined with the vibrant marine life surrounding it, transforms the central boulder into a visual masterpiece, leaving a lasting imprint on the memories of those fortunate enough to witness its grandeur.

In essence, the Koh Tachai Pinnacle, with its Twin Peaks and central granite boulder, unfolds as a realm of underwater majesty. From intricate swim-throughs to bustling coral plateaus, this dive site encapsulates the unparalleled beauty and biodiversity that the Andaman Sea has to offer. Divers embarking on this aquatic adventure find themselves immersed in a world where nature’s architectural marvels and marine life’s diversity converge, creating an experience that transcends the ordinary and lingers in the depths of memory.

Frogfish

Here camouflaged in the bush coral frogfish hide away from obvious sight, although even more experienced diver finds it still difficult to locate them. Descending further you come across several flat areas varying in depths, stepping down to a sandy bottom at 30m and deeper where Jenkins’ rays, as well as whitetip and blacktip reef sharks, rest in the sand. Which direction to spiral up the contours of the rocks, really depends upon the current. In fact, the stronger current brings a constant supply of nutrients to the site which benefits many species of fish and coral. In the west section, you will find large boulders with swim-throughs. In the north, the rocks are fully carpeted in soft corals and large, impressive sea fans where glassfish seek shelter behind, while the east area is dotted with hard coral and sea whips.

A Symphony of Marine Life at Koh Tachai Pinnacle: Exploring the Underwater Gathering

As divers venture into the depths surrounding the Koh Tachai Pinnacle, they become immersed in a vibrant and bustling ecosystem, a true spectacle of marine life diversity. This underwater realm serves as a sanctuary for numerous species of fish, creating a dynamic and harmonious environment that captivates all who explore its depths.

Koh Tachai Dive Site Mid-Water Marvels: Large Schools in Motion

One of the striking features of Koh Tachai dive site is the mesmerizing presence of large schools of fish gracefully navigating the mid-water. Divers are greeted by the shimmering silver spectacle of barracuda, their synchronized movements creating an intricate dance against the backdrop of the azure sea. Trevally, with their sleek and streamlined forms, weave through the water with precision, forming an integral part of this underwater symphony.

Batfish Ballet: Graceful Dancers of the Deep

Adding to the enchantment are the batfish, elegant and graceful in their underwater ballet. These sociable creatures move in unison, their strikingly beautiful dorsal and pectoral fins creating an almost ethereal display. As divers navigate the underwater landscapes, batfish become companions, their presence enhancing the sense of connection with the marine world.

Snappers in Formation: A Visual Delight

Snappers, with their vibrant colors and intricate patterns, form another integral part of the underwater gathering at Koh Tachai Pinnacle. These agile and agile fish move in harmony, creating mesmerizing patterns that captivate the eyes of divers. The diversity of snapper species adds layers of color and life to the coral-rich surroundings.

The Majestic Napoleon Wrasse: A Regal Presence

Amidst the marine congregation, the regal Napoleon wrasse makes its presence known. Slowly swimming by, this distinguished fish, with its prominent hump on the forehead, becomes a highlight of the dive. The Napoleon wrasse, often solitary and contemplative, adds an aura of majesty to the underwater landscape, becoming a sought-after sighting for divers exploring the depths of Koh Tachai Pinnacle.

Oceanic Triggerfish: A Rare Encounter

In the depths of Koh Tachai Pinnacle, an elusive resident makes occasional appearances—the oceanic triggerfish. These dark-colored triggerfishes, typically inhabitants of far-off oceanic expanses, find a unique habitat in the vicinity of the pinnacle. Their rare sightings add an element of mystery and exclusivity to the diving experience, leaving divers in awe of the wonders hidden beneath the waves.

Koh Tachai Dive Site – Frequent Encounters with Sea Turtles: A Natural Highlight

As if choreographed by nature itself, frequent encounters with sea turtles elevate the underwater experience at Koh Tachai Pinnacle. These graceful and ancient beings gracefully glide through the water, their presence a reminder of the interconnectedness of marine life. Divers are treated to intimate moments with these gentle creatures, further enriching the overall diving adventure.

In essence, Koh Tachai Pinnacle emerges not only as a geological wonder but as a thriving community of marine life, where schools of fish, majestic wrasses, elusive triggerfish, and serene sea turtles converge in a mesmerizing underwater spectacle. Each dive becomes a journey into the heart of this aquatic gathering, where nature’s symphony unfolds in the company of these marine residents, creating an experience that resonates with the beauty and vitality of the Andaman Sea.

Southern Pinnacle

Navigating Koh Tachai Pinnacle: A Journey Between Twins

Venturing from the north side of the southern pinnacle at Koh Tachai, divers are treated to a captivating underwater transition. A sandy patch, unfurling at 24 meters depth, beckons divers to explore further, leading to the northern pinnacle positioned approximately 50 meters away. The journey unfolds as a seamless underwater exploration, revealing the smaller pinnacle whose apex lies at a depth of 18 meters, resembling its more prominent southern twin.

The Northern Pinnacle: A Subtle Majesty

As divers ascend to the top of the northern pinnacle, they are embraced by the subtle majesty of this smaller underwater formation. Despite its comparative size, the northern pinnacle echoes the grandeur of its southern counterpart, showcasing its unique features and marine life. The topography, though smaller in scale, unfolds as a testament to the geological wonders that characterize Koh Tachai Pinnacle.

A Dive into Diversity: Koh Tachai’s Allure

Koh Tachai Pinnacle, with its dual peaks and connecting sandy path, offers divers a comprehensive and diverse underwater experience. The landscape transitions seamlessly between the southern and northern pinnacles, creating a dynamic environment where stunning landscapes, intricate macro life, and awe-inspiring big fish encounters converge.

Stunning Landscapes: Nature’s Artistry Below the Surface

The allure of this Koh Tachai dive site extends beyond its geological formations. The underwater landscapes, adorned with coral plateaus, swim-throughs, and channels, reflect nature’s artistry below the surface. Hard and soft corals create a vibrant and visually stunning backdrop, transforming each dive into an exploration of underwater aesthetics.

Macro Life: Unveiling Nature’s Miniature Wonders

For enthusiasts of macro photography, Koh Tachai Pinnacle becomes a haven of miniature wonders. As divers navigate the intricate formations, hidden gems reveal themselves—colorful nudibranchs, elusive seahorses, and intricate critters adorn the coral-rich environment. The smaller scale of the northern pinnacle provides an intimate canvas for divers to uncover these marine marvels.

Big Fish Encounters: A Thrilling Underwater Symphony

Beyond the subtleties of macro life, Koh Tachai Pinnacle is renowned for its thrilling big fish encounters. Schools of barracuda, trevally, and batfish elegantly navigate the waters, creating a dynamic and exhilarating underwater symphony. The possibility of encountering larger marine residents, such as manta rays or whale sharks, adds an element of excitement to each dive, making Koh Tachai a destination brimming with anticipation.

A Sanctuary for Ocean Giants: Manta Rays and Whale Sharks

Nature’s unpredictability unfolds as divers explore Koh Tachai Pinnacle, keeping a vigilant eye on the surroundings. The dive site has earned a reputation as a potential sanctuary for ocean giants—manta rays and whale sharks. If these majestic creatures are not gracing the waters of Richelieu, they might choose Koh Tachai as their underwater haven. Divers are reminded to keep their eyes open, as the ocean’s giants may unveil themselves in an unexpected dance beneath the waves.

In essence, Koh Tachai Pinnacle offers a multifaceted underwater adventure, seamlessly transitioning between twin peaks, unveiling stunning landscapes, celebrating macro life, and enticing divers with the promise of big fish encounters. This underwater sanctuary, with its subtle majesty and diverse marine offerings, stands as a testament to the wonders that await those who dare to explore the depths of the Andaman Sea.

All about the dive at Koh Tachai Reef

Divers regularly encounter leopard sharks in the outer sandy area. Staghorn coral, brain coral, fire coral, and pore coral cover the entire area and attract the general reef fish like pufferfish, lionfish, scorpionfish, and parrotfish. Moray eels, spending the majority of their time hiding in holes and crevices for their own predators, are awaiting the perfect ambush of any unsuspecting prey. Despite their snake-like appearance, moray eels (along with other eel species) are in fact fish and not reptiles.

At night-time, several different species of crab and shrimp come out for hunting and been hunted.

Spotfin Lionfish

Then it is also possible to see a rare solitary species of Lionfish here too. The spotfin lionfish is easily separated from other species by the eye-spots on the dorsal fin and its Fu-Manchu mustache. It eats only live food like shrimps, gobies, and blennies. Adult spotfin lionfish will even eat smaller members of their own species. It is a secretive fish that spends the daytime hours hanging upside down in deeper crevices and caves. A diver might occasionally catch a glimpse of one of these fish moving from one crevice to another during the day.

Night dives

However, it is most readily observed during night dives, at which time it comes out to hunt. It exhibits an unusual behavior when it feeds. It will snap its dorsal spines and shake its head from side-to-side as it approaches its prey. This behavior may serve to distract, or possibly attract the prey. It often stalks its quarry by slinking along the bottom or around reef structure like a cat and moves forward, either by “hopping” on its pelvic fins or by waving its caudal fin. When it is about one-half a body length away from its prey, it lunges forward with amazing speed to ingest it.
All in all, Koh Tachai Reef makes a fine and easy dive, whether through the day or night.