Hirokawa Maru - Bonegi 1

Hirokawa Maru — known locally as Bonegi 1 — is one of the most accessible and historically significant wreck dives in the Solomon Islands, a Japanese cargo transport that came to rest in the shallow waters off Guadalcanal during the ferocious naval and air campaign that made this island synonymous with some of the fiercest fighting of the Pacific War. The wreck lies so close to the beach at Bonegi that parts of her superstructure are visible above the waterline at low tide, making her one of those rare dive sites where the transition between the accessible surface world and the underwater wreck is seamless and immediate. The Hirokawa Maru was a Japanese Type 2TL transport vessel — one of the supply ships that formed the desperate Tokyo Express resupply missions to Japanese forces trapped on Guadalcanal after the American landings in 1942. The ship was bombed and strafed by American aircraft while attempting to land supplies on the beach, the attack setting her on fire and eventually driving her onto the shoreline where she foundered. She now lies partly on her side in shallow water, her bow in the shallows and her stern descending to approximately 40 metres — a depth profile that accommodates beginners on the upper sections and draws more experienced divers to the deeper stern. The wreck has been colonising since 1942, and more than 80 years of marine growth have transformed the vessel into a coral-encrusted artificial reef of considerable beauty. The hull is covered in hard and soft corals — the warm, nutrient-rich waters of the Iron Bottom Sound that surrounds Guadalcanal support explosive coral growth that has softened every angular feature of the original vessel into curves of living reef. Large sea fans and black coral trees extend from the deeper sections. Schools of glassfish fill the holds and passageways with silver clouds. For beginner divers, the upper sections of the Hirokawa Maru provide an ideal wreck experience: shallow enough for extended time, clear enough for excellent visibility, and rich enough in both historical detail and marine life to fully reward the dive. Standing at the bow of this vessel, surrounded by the coral that has reclaimed it and the fish that now call it home, while knowing the history of the battle that put it here, is an experience that combines adventure, natural beauty, and historical weight in a proportion that few dive sites in the world can match.