Dive Site: Mawali Wreck

About Mawali Wreck

The Mawali Wreck, a Japanese cargo ship, rests on its side in the Lembeh Strait, off the northern coast of Sulawesi. Sunk by Allied forces in 1943 during World War II, this 90-meter long freighter is now a thriving artificial reef, encrusted with diverse hard and soft corals and sea fans. It offers a unique blend of historical exploration and vibrant marine ecosystems. The wreck's topography features the bow section at around 25 meters, while the stern extends deeper to 35-40 meters, making it suitable for advanced divers. The site is characterized by sloping sandy sides that transition into the deeper parts of the Strait, allowing for flexible dive profiles that can accommodate various depths. Marine life thrives on and around the wreck, attracting schools of snappers and batfish, as well as resident lionfish and scorpionfish. Macro enthusiasts will discover an abundance of nudibranchs, ghost pipefish, and mantis shrimp, alongside the famous Bargibanti pygmy seahorses. This rich biodiversity makes it a prime location for detailed observation and underwater photography. Diving the Mawali Wreck typically involves a slow descent along the sloping bottom, allowing ample time to search for critters before reaching the main wreck structure. The dive then proceeds along the wreck, exploring its various sections, with the ascent conducted in a zig-zag pattern back up the slope to maximize marine life encounters. Conditions are generally calm, making for an enjoyable and focused dive experience.

Dive site facts: Mawali Wreck

Depth

25–40 m

Current

Mild to none

Water temperature

27–29°C

Entry

Boat

Level

Advanced Open Water recommended

Dive type

Wreck, macro, coral reef

Region / port

Lembeh Strait, North Sulawesi

Coordinates

4.6515° S, 123.8996° E

Conditions & Currents

The Lembeh Strait, where the Mawali Wreck is located, is tidal, but currents are generally mild to nonexistent due to the strait's width and protected nature. This calm environment contributes to exceptionally easy diving conditions, allowing for slow, detailed exploration of the wreck and its marine inhabitants. Divers typically begin their descent near the banks and follow the sloping bottom to their planned depth, often moving diagonally with any gentle current present. Visibility can be excellent, though it may be reduced compared to clear reef diving, which is not a hindrance given the focus on close-up observations. There are no significant thermoclines reported, and boat traffic is managed to ensure diver safety and a tranquil underwater experience.

Marine life & sighting chances

Bargibanti pygmy seahorse

common

Nudibranchs

common

Crustaceans

common

Snappers

common

Batfish

common

Lionfish

common

Scorpionfish

common

Frogfish

common

Triggerfish

common

Leaf fish

common

Ghost pipefish

occasional

Mantis shrimp

occasional

Dive profile & how the dive runs

Diving the Mawali Wreck typically starts with a boat entry, positioning divers close to the sloping banks of the Lembeh Strait. The descent follows the sandy slope in a diagonal direction, often with any mild current, allowing divers to gradually reach the wreck. The main wreck structure begins around 25 meters for the bow section, extending to 35-40 meters at the stern. Divers spend a significant portion of the dive exploring the coral-encrusted hull, deck, and deck buildings, observing the abundant marine life. The emphasis is on slow, careful observation rather than covering large distances. The ascent is performed in a zig-zagging pattern up the slope, mimicking a slalom skier, to cover more area and maximize critter sightings as divers gradually shallow out. Safety stops are conducted at shallower depths along the slope, ensuring thorough decompression and further opportunities for macro discoveries before surfacing.

Underwater photography

The Mawali Wreck is an excellent site for both macro and wide-angle photography. For macro subjects like Bargibanti pygmy seahorses, nudibranchs, and various crustaceans, a macro lens (e.g., 60mm or 100/105mm) is essential. A snoot can be particularly effective to highlight tiny subjects against the backdrop of the wreck or sandy bottom. For wider shots, consider a fisheye or wide-angle lens to capture the full scope of the 90-meter freighter, especially its coral-covered sections and schools of fish. Given the potential for deeper sections and the structure of the wreck, external strobes are highly recommended to bring out vibrant colors and detail. Maintain excellent buoyancy to avoid stirring up silt and to protect the delicate corals and marine life inhabiting the wreck. Patience is key; spend time observing a single area, as many critters are masters of camouflage.

Combine with nearby dive sites

• Coral Garden Tulamben

  Coral Garden in Tulamben, Bali, is an easily accessible shore dive situated between the famous USAT Liberty Wreck and the dramatic Drop Off.

• USAT Liberty Wreck

  The USAT Liberty, a 120-meter American cargo ship, is arguably Bali's most famous dive site, offering an unparalleled underwater experience…

• Nudi Falls

  Nudi Falls is a renowned macro dive site located on the mainland side of the Lembeh Strait, a narrow channel between mainland Sulawesi and…

Getting there & logistics

Access to Mawali Wreck is typically via liveaboard or day boats operating from resorts in the Lembeh Strait. The main gateway to the Lembeh Strait is Manado (MDC) airport in North Sulawesi, Indonesia. From Manado, transfers are arranged towards Bitung and the Lembeh Strait area, usually involving a scenic drive followed by a short boat ride to Lembeh Island or the mainland dive operators. Dive trips in Lembeh are often focused on the unique muck diving experience, and Mawali Wreck is a highlight of many itineraries. A typical liveaboard or resort stay can range from 7 to 10 days, allowing ample opportunity to explore multiple sites within the strait. There are no specific permits mentioned for diving the wreck beyond standard dive operator fees.

Safety & environment

Diving the Mawali Wreck, especially its deeper sections, necessitates advanced diver certification and adherence to safe diving practices. The nearest recompression chamber is located in Manado, approximately a 1.5-hour drive from Bitung, making evacuation a consideration in case of a dive emergency. Divers should always carry appropriate dive insurance that covers recompression and emergency medical evacuation. Site-specific hazards include the potential for entanglement with fishing nets or lines, as well as sharp edges on the wreck itself, though these are typically cleared by dive operators. Divers are advised to maintain excellent buoyancy control to avoid damaging the delicate corals and marine life, and to prevent stirring up silt that can reduce visibility. Always follow your dive guide's instructions, especially regarding penetration, as the wreck should only be explored from the exterior unless specifically certified and accompanied.

Who it suits — and who it doesn't

FAQ

Mawali Wreck FAQ

Liveaboards diving Mawali Wreck

These liveaboards may visit Mawali Wreck on selected itineraries — the exact dive sites depend on departure, weather and conditions.

Naga Biru

Indonesia

12 guests40 m

$273/day

Ecopro Duyung Baru

Indonesia

6 guests27 m

$316/day

Jaya

Indonesia

14 guests23 m

$280/day

Wellenreng

Indonesia

9 guests25 m

$427/day

Komodo Aggressor

Komodo, Indonesia

16 guests29 m

$312/day

Blue Manta

Indonesia

20 guests45 m

$488/day

Mari

Indonesia

14 guests32.2 m

$328/day

Situju7

Komodo, Indonesia

10 guests32.7 m

$362/day

Pindito

Indonesia

16 guests37.79 m

$533/day

Mermaid II

Komodo, Indonesia

18 guests

$355/day

Pearl of Papua

Raja Ampat, Indonesia

14 guests30 m

$303/day

Putri Naga

Komodo, Indonesia

6 guests25 m

$222/day