The WW II Japanese underground hospital at Gunanur Plantation. During World War II, the Japanese military established an underground hospital at the Gunanur plantation in Rabaul, Papua New Guinea. This hospital, also known as the "Tunnel Hill Hospital," was a strategic and well-hidden medical facility designed to provide care for injured Japanese soldiers during the war. The construction of the underground hospital began in early 1942 when the Japanese occupied Rabaul following their successful invasion of the island. The location of the hospital at Gunanur plantation was chosen due to its remote and secluded nature, making it less vulnerable to enemy attacks. The hospital was built using forced labor, mainly consisting of local Papua New Guineans and Korean prisoners of war. The hospital complex was constructed with multiple interconnected tunnels and chambers dug into the hillside, providing protection from both enemy bombings and the harsh tropical climate. The undergrou...