 Various people speculated that Crabb had been killed by some secret Soviet underwater weapon; that he had been captured and imprisoned in Lefortovo prison with prison number 147, that he had been brainwashed to work for the Soviet Union to train their frogman teams; that he had defected and became a commander in the Soviet Navy; that he was in the Soviet Special Task Underwater Operational Command in the Black Sea Fleet; or that MI6 had asked him to defect so he could become a double agent.On 26 March 2006, "The Mail on Sunday" published an article by Tim Binding entitled "Buster Crabb was murdered – by MI5".Binding wrote a fictionalised account of Crabb's life, "Man Overboard" which was published by Picador in 2005.