Two crewmen from the Oberon class submarine HMAS OTAMA, (LCDR R. Taubman, RAN), lost their lives, in heavy seas off the east coast of Australia, when OTAMA dived while they were still on the submarines casing. The two men were Able Seaman Hugh Edward Markcrow, and Seaman Damien Humphries. Despite an intensive air and sea search, neither body was ever recovered. A Board of Inquiry into the incident revealed that the two men had gone back onto the casing to secure loose equipment, after having been already checked off as coming inside the submarine’s pressure hull. Their absence was then not noticed for some time.