Historic HTMS Mataphon Shipwreck Pattaya

Diving Into the Historic HTMS Mataphon Shipwreck Pattaya

Beneath the warm, tropical waters off Koh Larn lies one of the most fascinating dive sites in Thailand—the Historic HTMS Mataphon Shipwreck Pattaya. Once a battle-hardened WWII vessel, this retired warship now rests peacefully on the ocean floor, transformed into a vibrant artificial reef that draws both history buffs and scuba lovers from around the world.

As part of the growing network of scuba diving Pattaya shipwrecks, the Mataphon wreck offers something rare: a shallow, accessible, and ecologically rich dive that blends military history with marine biodiversity. Whether you’re just beginning your journey into wreck diving Pattaya or seeking a relaxing second dive after exploring deeper sites, this sunken warship is a must-visit.

Positioned just off the coast of Koh Larn, the HTMS Mataphon dive site Thailand is one of the best examples of a sustainable artificial reef project. It’s now home to colorful reef fish, curious moray eels, and even elusive seahorses—making it perfect for fun diving Pattaya style: laid-back, adventurous, and unforgettable.

In this guide, you’ll discover the full story of HTMS Mataphon—from its origins as a WWII landing craft to its royal dedication and final sinking as an eco-conscious dive attraction. We’ll walk you through dive conditions, marine life, diver reviews, and compare it to other wrecks like HTMS Khram and HTMS Kut. If you’re planning your next scuba trip in Pattaya, this blog will show you why the Mataphon wreck belongs on your bucket list.

Historical Background of HTMS Mataphon

Before becoming one of the most accessible and beginner-friendly wreck diving Pattaya attractions, the Historic HTMS Mataphon Shipwreck Pattaya had a long and honorable life above the surface. Originally built in 1944 as USS LCT-1260, this Landing Craft Tank served with the U.S. Navy during World War II and participated in major operations across the Pacific, including the liberation of Luzon in the Philippines.

After the war, the ship was transferred to the Royal Thai Navy in 1947 under post-war military assistance programs. Renamed HTMS Mataphon—after an island in the Andaman Sea—it became part of the “Mataphon-class” landing vessels that played a crucial role in Thailand’s coastal defense and logistics. Over the next 60+ years, this vessel contributed to countless naval operations, from amphibious drills to logistics support.

Although the ship never saw combat while serving Thailand, it remained active until 2008, making it one of the longest-serving vessels in the fleet. Rather than being scrapped, the navy, in collaboration with marine conservation organizations like Dive Tribe and the Department of Marine and Coastal Resources (DMCR), decided to give the ship a second life as a dive site. This decision laid the foundation for what is now known as the HTMS Mataphon dive site Thailand—a blend of military history and marine ecology.

Today, this retired vessel is celebrated not only for its legacy but also for its transformation into a thriving artificial reef. As part of the ever-expanding collection of scuba diving Pattaya shipwrecks, it serves as a living classroom for new divers, underwater photographers, and conservationists alike.

The Sinking as an Artificial Reef

In October 2012, the HTMS Mataphon was given a new mission—not on the battlefield, but beneath the waves. After more than six decades of service in the Royal Thai Navy, the ship was officially retired and prepared for scuttling. Rather than dismantling the vessel, the Thai government—working closely with environmental organizations like the Dive Tribe and the Department of Marine and Coastal Resources (DMCR)—chose to transform it into a thriving artificial reef.

The sinking took place in a carefully planned ceremony just off the southeast coast of Koh Larn, only a short boat ride from Pattaya. This initiative marked the beginning of what is now known as the Historic HTMS Mataphon Shipwreck Pattaya, one of the most important artificial reefs in the region. Designed with scuba diving tourism and marine conservation in mind, the ship was meticulously cleaned and stripped of pollutants, fuel, and hazardous materials to ensure a safe underwater environment for marine life and divers alike.

Divers now know it as one of the easiest and most enjoyable scuba diving Pattaya shipwrecks, thanks to its shallow resting depth and proximity to the mainland. In fact, the HTMS Mataphon sits upright on a sandy bottom just southeast of Koh Larn, making it an ideal stop for dive trips that focus on fun diving Pattaya waters.

The project wasn’t just about diving—it was a statement. The scuttling was part of a royal initiative commemorating the 60th birthday of Thailand’s Crown Prince Vajiralongkorn (now King Rama X), lending historical and cultural significance to what is now a popular wreck diving Pattaya destination.

This purposeful sinking turned the HTMS Mataphon dive site Thailand into more than just a sunken ship—it became a beacon for eco-tourism, a habitat for marine biodiversity, and a training ground for new divers discovering the underwater world.

Dive Site Profile and Conditions

The HTMS Mataphon dive site Thailand is one of the most accessible and well-loved wrecks in the region. Resting just off the southeast shore of Koh Larn, it’s a quick 40–45 minute boat ride from Pattaya’s Bali Hai Pier, making it a frequent stop on daily fun diving Pattaya trips. Its location in a relatively sheltered channel also means dive boats can access it in a wide range of weather conditions—an important factor for both dive operators and beginners.

The wreck sits upright on a sandy seabed at a maximum depth of 20–23 meters, with the main deck and structures rising to around 15 meters. This shallow profile allows even Open Water certified divers to explore much of the wreck safely, though Advanced Open Water (AOW) is recommended for full access, especially if planning to enter the ship’s interior.

Despite its modest size—about 36 meters in length—the Mataphon offers a surprisingly complete dive experience. The ship’s flat-bottomed design, open cargo area, and preserved features like the wheelhouse, gun platforms, and visible propeller make it a fantastic training ground for wreck diving Pattaya certifications. Entry and exit points are wide and clearly marked, making light penetration dives possible for those with proper training.

Visibility at the HTMS Mataphon Shipwreck Pattaya typically ranges from 5 to 15 meters, depending on the season. The best time to visit is between November and April, when the Gulf of Thailand enjoys dry weather, calm seas, and clearer water. During the monsoon season (May to October), conditions can vary, and currents may be stronger, especially due to the site’s position in a tidal channel.

The seabed surrounding the wreck is composed of fine sand, and nearby you’ll find a scattering of concrete reef blocks nicknamed “Cube City,” part of the same artificial reef effort. These additional structures add depth to the site, drawing in more marine life and offering macro photographers bonus exploration areas beyond the ship itself.

Because of its conditions, the HTMS Mataphon dive site Thailand is especially popular for fun diving Pattaya adventures, check dives, and wreck specialties. It strikes the perfect balance between history, accessibility, and biodiversity.

Marine Life and Ecological Role

Since its intentional sinking in 2012, the Historic HTMS Mataphon Shipwreck Pattaya has undergone a breathtaking transformation. Once a steel war machine, it now functions as a thriving artificial reef—a perfect example of how human-made structures can support marine biodiversity when planned responsibly. Today, the HTMS Mataphon dive site Thailand is a vibrant underwater habitat attracting everything from macro critters to schooling predators, making it a favorite for scuba diving Pattaya shipwrecks tours and underwater photographers alike.

Coral Colonization and Reef Formation

Within just months of its sinking, the wreck was already showing signs of biological colonization. Soft corals, tunicates, and tube sponges quickly took hold of the metal surfaces, forming colorful carpets over railings, beams, and bulkheads. Now, over a decade later, patches of hard corals like Porites and Montipora have started to establish themselves—proof that the structure is evolving into a permanent reef ecosystem.

The surrounding “Cube City” reef blocks, placed strategically around the wreck, have helped accelerate coral growth and offer additional vertical relief for fish and invertebrates. These cubes now act as nurseries, shelters, and hunting grounds for various species, increasing the site’s ecological complexity. This success story has cemented Mataphon’s status as a model for artificial reef Pattaya diving efforts.

Resident and Visiting Marine Life

Divers visiting the HTMS Mataphon Shipwreck Pattaya frequently encounter a variety of reef fish and pelagic species that have made the wreck their home. Among the most commonly sighted:

• Batfish circling near the superstructure in small groups
• Schools of fusiliers, snapper, and yellowtail barracuda swarming the hull
• Trevally (jacks) patrolling the outer perimeter, hunting for smaller fish

The wreck also offers a haven for macro life—a delight for critter spotters and photographers. Sharp-eyed divers often find:

• Nudibranchs of multiple species crawling along encrusted pipes
• Ghost pipefish hovering near debris
• Moray eels poking out from the bridge or lower deck holes
• Scorpionfish and stonefish camouflaged on flat steel surfaces (caution advised!)
• Seahorses gripping coral whips or netting inside the cargo hold
• Occasional blue-spotted rays resting on the sandy bottom nearby
• Reports of juvenile lionfish and reef octopus around the aft section

On lucky days, even sea turtles have been spotted passing by, adding a sense of magic to the dive.

The Role in Ecosystem Restoration

The Mataphon wreck was intentionally placed in a previously barren stretch of sandy seabed with minimal biological activity. By offering vertical relief and hard surfaces for coral larvae to attach to, it helped spark an entire reef community where none existed. This is the essence of a successful artificial reef—creating new habitat, shelter, and food sources in areas previously unsuitable for reef life.

The HTMS Mataphon dive site Thailand also relieves diving pressure from natural coral reefs around Pattaya. With thousands of dives logged yearly at this site, many of which would have otherwise targeted fragile coral ecosystems, Mataphon effectively serves as a diver decoy—absorbing tourism impact while still delivering an incredible underwater experience.

Conservation, Education & Long-Term Impact

Environmental groups such as Dive Tribe Thailand and the DMCR (Department of Marine and Coastal Resources) continue to monitor the site’s growth and environmental balance. The wreck now functions not only as a recreational dive site but also as an underwater classroom. Dive instructors often use the site to teach conservation awareness, fish identification, and wreck diving Pattaya safety principles.

Because of its manageable depth and calm conditions, Mataphon is widely used for fun diving Pattaya excursions and dive training. New divers are introduced not just to scuba skills, but also to marine ecology and the importance of reef-friendly behavior—making this wreck a key player in ocean literacy.

Dive Planning and Safety

The HTMS Mataphon dive site Thailand stands out as one of the most beginner-friendly and accessible wreck diving Pattaya locations. Whether you’re newly certified or looking to complete your wreck specialty, this dive site offers the perfect balance of history, marine life, and safety. With its moderate depth, calm conditions, and clearly laid-out structure, it’s no surprise that many divers consider it their first wreck experience in fun diving Pattaya.

Required Certification Level

While the Historic HTMS Mataphon Shipwreck Pattaya reaches a maximum depth of 23 meters, the top of the wreck sits comfortably at around 15 meters. This makes it technically accessible for Open Water certified divers, although Advanced Open Water (AOW) is highly recommended to:

• Dive to the full depth
• Explore the lower decks
• Handle mild currents confidently
• Qualify for light wreck penetration (if trained)

Need to upgrade your certification? Check out our PADI Advanced Open Water course or try a Discover Wreck Diving experience.

Penetration Opportunities and Dive Profile

The ship was specially prepared before scuttling to make wreck exploration safe and educational:

• Wide-open entry points at the bridge and cargo hold
• Cleared of all entanglement risks and pollutants
• Multiple swim-through corridors, especially for trained wreck divers

Certified wreck divers can enter the upper compartments using proper techniques: guideline reels, torches, and 1/3rd air rule. Penetration into lower areas (like the engine room) is reserved for experienced divers with proper training due to tight spaces and silt risk.

A typical dive profile:

• Descent along the buoy line directly attached to the wreck
• Tour the main deck (15–18m), bow, and superstructure
• Optional descent to the sand (20–23m) to view the propellers and reef cubes
• Slow ascent with a safety stop at 5 meters (using the line in case of current)

Want to explore inside the wreck? Join one of our Wreck Specialty courses or guided penetrations.

Conditions and Ideal Timing

• Best Season: November to April – calm seas, warm water (~28–30°C), and clearer visibility (up to 15m)
• Low Season: May to October – still diveable, but with a chance of stronger currents and murkier conditions
• Tidal Flow: Site lies in a channel between Koh Larn and Koh Krok; plan dives during slack tide for easiest entry
• Current Strategy: Use descent line and surface marker buoy (SMB) on ascent to avoid drifting during mid-water stops

The HTMS Mataphon Shipwreck Pattaya is often scheduled as the second dive of a two-tank day trip, especially after a deeper dive on HTMS Khram or HTMS Kut. This makes it ideal for fun diving Pattaya packages where divers want a relaxed, long second dive after off-gassing from a 30-meter profile.

Safety Tips for All Levels

• Check your air and NDL frequently—Mataphon is easy to overstay on due to its shallow depth
• Watch buoyancy closely: avoid touching soft corals or silty surfaces
• Avoid entering the wreck without proper training and gear
• Bring a dive torch to peek inside dark compartments, even if not entering
• Always carry and know how to deploy an SMB (surface marker buoy)
• Stay with your buddy—there are multiple compartments and corners to explore

Mataphon is also used as a training site for rescue simulations, navigation, and marine biology briefings. It’s often included in conservation-focused diving courses and scuba internships in Pattaya.

HTMS Mataphon vs Other Pattaya Wrecks (Khram & Kut)

The Historic HTMS Mataphon Shipwreck Pattaya may not be the largest or the deepest wreck in the Gulf of Thailand, but it holds a unique place among the famous scuba diving Pattaya shipwrecks. To understand its value for divers—especially beginners or those seeking a more relaxing wreck experience—it’s helpful to compare it with its two sister wrecks: HTMS Khram and HTMS Kut.

First, in terms of depth and accessibility, Mataphon is the shallowest of the three. While HTMS Khram and HTMS Kut rest at around 30–31 meters and require Advanced Open Water certification, the HTMS Mataphon dive site Thailand lies between 15 to 23 meters. This makes it suitable even for confident Open Water divers and absolutely ideal for wreck specialties, check dives, and second-dive excursions on two-tank trips. This ease of access is one reason Mataphon is often recommended as an introduction to wreck diving Pattaya.

In terms of size and layout, Mataphon is noticeably smaller—only about 36 meters in length—compared to Khram and Kut, which stretch closer to 60 meters. That said, Mataphon’s layout is highly diver-friendly. It was purposefully prepared with open compartments and easy swim-throughs, which makes it less intimidating for first-time wreck explorers. In contrast, HTMS Kut is known for its more complex penetration routes and tighter spaces, appealing to advanced divers with technical or wreck training. Khram, on the other hand, offers a mix of spacious swim-throughs and intact decks, making it a favorite among seasoned recreational divers.

When it comes to marine life, HTMS Khram currently leads in biodiversity due to its longer submersion (since 2003). Divers often report encounters with groupers, sweetlips, batfish, and even turtles. HTMS Kut, sunk in 2006, also has rich coral coverage and often sees schools of barracuda and resident rays. However, the HTMS Mataphon Shipwreck Pattaya is quickly catching up. Since 2012, it has developed a surprisingly rich ecosystem of soft corals, sponges, nudibranchs, and pelagic visitors like fusiliers and trevally. What it lacks in massive schools or deep drop-offs, it makes up for with excellent macro life and photogenic conditions—especially appealing for those who enjoy fun diving Pattaya in bright, shallow water.

From a historical perspective, Mataphon arguably has the most compelling backstory. Originally a U.S. Navy landing craft from World War II, she served in the Pacific Theater before being transferred to Thailand and serving over 60 years in the Royal Thai Navy. While both Khram and Kut also share U.S. military origins, their stories are less detailed and documented than Mataphon’s wartime and peacetime contributions. For divers who appreciate maritime history alongside marine biology, Mataphon offers the best of both worlds.

Finally, in terms of diver popularity, HTMS Khram is still the most requested wreck dive in the region due to its size, depth, and marine life diversity. HTMS Kut is popular among those specifically seeking challenging penetrations or technical training. However, wreck diving Pattaya wouldn’t be complete without including Mataphon in the lineup. Many divers choose to start with Mataphon, then progress to Kut and Khram as their skills and certifications advance. Its calm conditions and approachable layout make it perfect for first-timers, underwater photographers, and conservation-focused dive tours.

Diver Experiences and Pro Tips

Many divers who visit the Historic HTMS Mataphon Shipwreck Pattaya describe it as a “hidden gem” among scuba diving Pattaya shipwrecks—not because it’s unknown, but because it often exceeds expectations. What may first appear to be a small, beginner-friendly wreck turns out to be a surprisingly rich, intimate dive site with layers of history, ecology, and adventure waiting to be discovered.

Divers who first explore the wreck often highlight its natural lighting. Because the wreck sits between 15 to 23 meters deep, there’s ample ambient light that makes the ship’s structure clearly visible even without a torch—great for relaxed exploration and underwater photography. Wide-angle shots of divers swimming above the wheelhouse or next to the encrusted bow are especially popular among underwater photographers.

For macro lovers, several frequent visitors say this is one of the best sites for spotting nudibranchs, ghost pipefish, and seahorses in the region. One diver shared, “I went in thinking it was a quick second dive—but found myself captivated by the details. The coral growth and macro life around the stern were amazing.” Such experiences prove why the site is not only great for fun diving Pattaya, but also a paradise for slow, observant diving.

Many dive instructors use the HTMS Mataphon dive site Thailand for advanced training dives due to its stability and layout. It’s ideal for navigation practice, wreck introduction, and neutral buoyancy drills. Its ease of access also makes it a go-to site when conditions are too rough for further offshore wrecks like HTMS Khram or HTMS Kut.

Pro Tips for the Best Mataphon Dive

• Go early in the day. Morning dives typically enjoy better visibility and calmer surface conditions.
• Pair it with a deeper wreck. Dive HTMS Khram or Kut first, then Mataphon as your second, shallower, off-gassing dive. It’s a perfect match for wreck diving Pattaya packages.
• Switch between wide and macro lenses. Bring a wide-angle for full-wreck shots and a macro setup if you’re hunting for nudibranchs and pipefish. If you’re shooting on a compact camera, go with a red filter for great natural light balance.
• Use the mooring line for descent and ascent. The site lies in a channel, and currents—though usually mild—can pick up quickly with tidal shifts.
• Hover, don’t touch. Parts of the wreck are now covered with delicate soft corals, sponges, and juvenile marine life. Good buoyancy is essential, especially for new divers.
• Ask your dive guide. Local guides often know where resident critters like frogfish or scorpionfish tend to hang out, especially around the “Cube City” reef blocks nearby.

Many returning divers agree: while HTMS Khram offers more size and HTMS Kut offers more challenge, Mataphon offers the soul. It’s personal. Introspective. A place where beginners gain confidence and experienced divers slow down to appreciate the details.

Frequently Asked Questions about Historic HTMS Mataphon Shipwreck Pattaya

A Wreck Worth Discovering

The Historic HTMS Mataphon Shipwreck Pattaya is more than just a sunken warship—it’s a living reef, a classroom for new divers, a sanctuary for marine life, and a chapter in naval history preserved beneath the sea. Whether you’re just starting your diving journey or already certified for deeper wreck exploration, Mataphon offers an experience that blends ease, beauty, and meaning.

Unlike deeper and more challenging scuba diving Pattaya shipwrecks like Khram and Kut, Mataphon welcomes you with open arms—shallow enough for confidence-building, but rich enough for return visits. Every dive reveals more: a curious nudibranch, a swirling school of batfish, or a glimpse into the ship’s quiet, rusted corridors.

As one of the most rewarding sites for wreck diving Pattaya, this dive doesn’t just check a box—it stays with you.

If you’re ready to dive in, reach out through our Contact Us page or explore the full range of trips, training, and insights on our Scuba Diving in Pattaya page. From daily fun dives to advanced wreck specialties, we’re here to make your Mataphon experience safe, smooth, and unforgettable.