The Mount Kembla mine disaster, which killed 96 men and boys on 31 July 1902, remains Australia’s greatest peacetime disaster on land. When Stuart Piggin and I began writing our book on the disaster, I sought answers to two questions. First, what caused the disaster? Second, what did those who owned, worked in, and regulated the NSW coalmining industry do to prevent a recurrence, at Mount Kembla, or at any other mine?