Kogyo Maru
Depth is the range from the top of the site to its usual maximum; "recommended cert" is the mainstream-agency level operators usually ask for, not a legal rule. Currents and visibility change daily — treat everything here as planning ranges.
The Kogyo Maru, a freighter of roughly 130 m sunk in the September 1944 strikes, lies on her starboard side with her cargo still legible: holds full of construction materials for Japanese airfield works, including cement bags fused into stone, stacked framing, and tracked equipment that divers universally describe as the bulldozer. Swimming the tilted holds feels like touring a hardware depot mid-earthquake. Outside, soft corals and hydroids fuzz the port rail, sweetlips hold under the counter, and squid often hang off the masts. Penetration routes are roomy by Coron standards, though silt and angle still demand care.
The moment you come for: Cargo holds with cement and machinery, readable wartime purpose, comfortable side-lying swim-throughs
Topography: Hull on its starboard side on sand around 34-36 m
Know before you splash
Hazards: Depth on the sand, silt in the holds, and rotated orientation that confuses navigation.
Conservation: The cargo is the museum; prying anything loose is both illegal and vandalism.
Nitrox: Worth it here — profiles sit in the range where enriched air meaningfully extends no-stop time (with the training to use it).
Who you'll meet
Bigfin Reef Squid
Clownfish & Anemonefish
Lionfish
Nudibranchs
Oriental Sweetlips
For photographers
Wide angle: ★★★★☆ · Macro: ★★★☆☆ — editors' 1–5 rating of what this site gives each style of shooting