I-169 Submarine - Chuuk (Truk) Lagoon

40m Max

15-35m Vis

boat

Site Overview

I-169 Submarine is one of the most celebrated dive sites in Chuuk (Truk) Lagoon, a Japanese submarine in 30 to 40 m of water, lying intact but protected as a war grave with external diving only. The site is defined by a Japanese I-169 submarine resting largely intact in 30 to 40 m, its hull and conning tower draped in soft coral, dived external only as a protected war grave, creating an underwater landscape that rewards divers with every visit. Soft corals blanket the hull, with groupers, schooling fish and lionfish patrolling the structure and anthias adding colour to the shallow sections. Water clarity in this part of the Federated States of Micronesia is frequently excellent, with visibility often extending well beyond 15 metres and a comfortably warm tropical temperature year-round. The combination of healthy hard and soft corals, nutrient-rich currents and sheltered reef systems makes I-169 Submarine a reliable location for both macro photography and wide-angle encounters. Local dive operators run regular trips to the site from nearby bases, and the geography means conditions are suitable across a range of experience levels with appropriate guidance. Conservation is taken seriously throughout Micronesia, and I-169 Submarine benefits from marine protection that keeps fish stocks high and coral coverage dense. Divers who plan their visit around the calm season will find the most predictable conditions, though the site can be enjoyed throughout the year. I-169 Submarine deserves a place on any serious Pacific diving itinerary, offering a genuine taste of the untouched beauty that makes Micronesia diving so highly regarded internationally. Regular visitors note that the marine life here, including soft coral, groupers, schooling fish, lionfish, moray eel, anthias, makes every descent memorable.

Dive Briefing

"The dive at I-169 Submarine begins with a controlled entry and a short transfer from the nearest base, with the guide giving a full briefing on the site layout, expected marine life and emergency procedures. Descending toward a japanese i-169 submarine resting largely intact in 30 to 40 m, its hull and conning tower draped in soft coral, dived external only as a protected war grave, divers are immediately surrounded by soft coral, groupers, schooling fish, lionfish, with the reef revealing more detail the closer you look. The maximum depth reaches about 40 metres, while the average depth sits near 35 metres, so gas planning and a dive computer keep the profile safe and comfortable. Currents are described as mild, and the guide chooses the entry time to make the most of slack or mild flow, using a reef hook or DSMB when needed. The topography offers natural swim-throughs and ledges that shelter larger animals, and the open water above the reef often holds cruising pelagics. Throughout the dive, neutral buoyancy protects the fragile coral, and the group stays close to the guide to manage depth and any surge. The safety stop is completed in open water on a DSMB, and the boat follows the bubbles to collect divers at the exit point for a relaxed return to base. External-only diving is best on a calm morning dive, with a respectful approach to this war grave."