Steven Carruthers is an Australian maritime historian and former Royal Australian Navy serviceman who has spent more than four decades researching the Japanese submarine campaign in Australian waters during the Second World War. His work focuses particularly on the 1942 midget submarine attack on Sydney Harbour and the broader East Coast sea war. Carruthers has collaborated with divers, researchers, and heritage specialists, contributing to the documentation and interpretation of significant wartime wrecks, including the Japanese midget submarine M24. Ghost Below draws on decades of research to present a detailed and authoritative account of one of Australia's most compelling wartime mysteries.