The legacy of WWII has proved long-lasting in Papua New Guinea. From sunken ships and plane wrecks to discarded machinery and battlements, the remnants of war dot the landscape more than 75 years after the guns fell silent.

The township of Rabaul in East New Britain province is no exception. Along with war relics, the former provincial capital still features over 500km of military tunnels snaking beneath the township.

They are the tunnels of Rabaul, and this is their story.