 On 8 December 1942, during one such attack, two of the Italian frogmen, Lieutenant Visintini and Petty Officer Magro, died, probably killed by small explosive charges thrown from harbor-defence patrol boats, a tactic said to have been introduced by Crabb.Their bodies were recovered, and their swimfins and Scuba sets were taken and from then on used by Sydney Knowles and Crabb.Crabb was awarded the George Medal for his efforts and was promoted to lieutenant commander.