Dive Site: Shinkoku Maru

About Shinkoku Maru

The Shinkoku Maru is one of the iconic dive sites within Truk Lagoon, renowned as the world's premier wreck diving destination. This Japanese naval tanker, built in 1940 and sunk during Operation Hailstone in 1944, rests upright on an even keel, making it exceptionally accessible and a favorite among divers. The wreck's superstructure starts as shallow as 12 meters, descending to a maximum depth of 40 meters, allowing for extensive exploration across multiple dives. Over the decades, marine life has profoundly transformed the Shinkoku Maru into a vibrant artificial reef. Its decks, railings, and masts are now blanketed in colorful soft corals, while schools of fish, including batfish and barracuda, swirl around its structure. The transformation highlights the incredible resilience of nature, offering a unique juxtaposition of historical artifacts and thriving ecosystems. Divers can explore various parts of the ship, including the intact bridge, engine room, and cargo holds, which sometimes still reveal glimpses of its past purpose through items like the telegraph or medical supplies. The vessel's size and excellent preservation invite multiple penetration opportunities for appropriately certified divers, revealing the ship’s engineering and the stories it holds. Chuuk Lagoon's generally calm conditions and warm waters enhance the diving experience, providing excellent visibility for appreciating the scale and detail of this magnificent wreck. It's a compelling site for both its historical significance and its stunning marine biodiversity, drawing divers seeking an immersive journey through time and nature.

Dive site facts: Shinkoku Maru

Depth

12–40 m

Typical dive

20–30 m, 50–60 min

Current

Mild

Visibility

25–30 m

Water temperature

27–30 °C

Entry

Boat / tender

Level

AOWD recommended, wreck experience beneficial

Dive type

Wreck, penetration, reef

Night dive

Possible

Region / port

Chuuk Lagoon, Micronesia

Coordinates

7.355, 151.86

Conditions & Currents

Truk Lagoon generally experiences mild currents, contributing to comfortable diving conditions around the Shinkoku Maru. While the lagoon's sheltered nature provides calm waters, local currents can vary, particularly around wreck structures, requiring divers to remain aware of their position. Visibility is typically excellent, often reaching 30 meters, though it can occasionally be affected by rainfall or sediment disturbance within the wreck. Surface conditions are usually placid, facilitating easy entries and exits from dive boats, which often utilize hydraulic lifts for added convenience. The consistent water temperature means thermal protection is primarily for comfort and duration rather than combating thermoclines, which are typically found deeper than recreational limits, around 30 meters.

Marine life & sighting chances

Batfish

common

Barracuda

common

Dogtooth Tuna

occasional

Coral Grouper

common

Grey Reef Shark

occasional

Hawksbill Turtle

occasional

Soft Corals

common

Anemones

common

Jellyfish

common

Triggerfish

common

Dive profile & how the dive runs

Diving the Shinkoku Maru typically begins with a descent along the mooring line to the ship's superstructure, which starts around 12 meters. The initial exploration often focuses on the bridge area, where divers can observe the ship's telegraph and navigation equipment. From there, you can navigate towards the bow, noting the dense soft coral growth covering the decks. Penetration into the cargo holds is possible, revealing historical artifacts and often schools of fish sheltering inside. The engine room is another highlight, with various machinery still in place, though careful assessment of structural integrity is always advised. The dive progresses deeper along the ship's length, reaching the maximum depth of 40 meters at the keel, before ascending slowly along the structure back to shallower depths for the safety stop, often conducted along the mast or superstructure, which is rich in marine life.

Underwater photography

The Shinkoku Maru offers abundant photographic opportunities, from wide-angle shots of the entire wreck and its coral-encrusted features to macro details of the marine life that has colonized it. A wide-angle lens is ideal for capturing the grandeur of the ship's large sections, including the bridge, engine room, and expansive coral growth. For internal penetrations, ensure your strobes provide even illumination for larger scenes, while smaller, more focused lights can highlight intricate details in compartments. An external strobe system with TTL capability is highly recommended to manage exposures effectively, especially given varying ambient light levels inside the wreck and on reflective metal surfaces. Buoyancy control is paramount to avoid disturbing sediment or damaging delicate coral formations, particularly within confined spaces. Always maintain a respectful distance from artifacts and marine life, ensuring you do not touch or remove anything from this historical site.

Combine with nearby dive sites

• Nippo Maru

  Army cargo ship with tanks, artillery, and gas masks.

• Fujikawa Maru

  Aircraft carrier with Zero fighters and spectacular soft coral.

• Yamagiri Maru

  Cargo ship with large holds for exploration.

• Heian Maru

  The largest ship in Truk Lagoon, with expansive bridge and engine room.

• San Francisco Maru

  Deep wreck loaded with war materials, suited for technical dives.

• Gosei Maru

  The Gosei Maru is a compelling wreck dive in Truk Lagoon, Micronesia, offering a glimpse into World War II history beneath the waves.

Getting there & logistics

Accessing Truk Lagoon typically involves flying into Chuuk International Airport (TKK) on Weno Island. Most dive trips are conducted via liveaboards, which offer comprehensive itineraries covering multiple wrecks over several days, ranging from 6 to 10 nights. Alternatively, land-based dive resorts also provide daily boat dives to various sites within the lagoon. A marine park fee is usually required, often around $5 per person, to dive within the protected waters. Liveaboards like the M/V Odyssey are well-equipped to handle divers of all levels, including technical divers requiring mixed gases, and provide excellent crew-to-passenger ratios for guided explorations.

Safety & environment

Diving in Truk Lagoon requires adherence to strict safety protocols, particularly due to the nature of wreck diving and potential depths. The nearest recompression chamber is located within Chuuk Lagoon, offering critical support in case of decompression sickness, though evacuation to a more advanced medical facility might be necessary for severe cases. Comprehensive dive insurance, including coverage for medical emergencies and evacuation, is highly recommended. Specific hazards at the Shinkoku Maru include overhead environments during penetrations, entanglement risks from discarded lines, and potential for cuts or abrasions from sharp metal edges. Divers must possess appropriate wreck diving certifications for internal exploration and always follow guide instructions to ensure safe navigation and minimize disturbance to the historical site and its delicate ecosystem.

Who it suits — and who it doesn't

FAQ

Shinkoku Maru FAQ

Liveaboards diving Shinkoku Maru

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

Palau Siren

Micronesia

16 guests

$501/day

Solitude Gaia

Micronesia

18 guests40 m

$310/day

Palau Aggressor II

Micronesia

18 guests32 m

$360/day

Black Pearl

Micronesia

24 guests

$390/day

Ocean Hunter 3

Micronesia

16 guests29 m

$350/day

Pacific Master

Solomon Islands

20 guests30 m

$268/day