 After the war Crabb was stationed in Palestine and led an underwater explosives disposal team that removed mines placed by Jewish divers from the Palyam, the maritime force of the Palmach elite Jewish fighting force during the years of Mandatory Palestine.After 1947, he was demobilised from the military.Crabb moved to a civilian job and used his diving skills to explore the wreck of a Spanish galleon from the 1588 Armada, off Tobermory on the Isle of Mull.