under way. However, the body tangled in something underwater, which meant it was not discovered for fourteen months. Houghton advanced the theory that Crabb's mission was to plant a small limpet mine on Ordzhonikidze, the purpose of which was to detect whether the Soviet Navy was using the latest sonar technology. If it was, the mine would detonate and the ship would slow down; if not, the mine would eventually detach and fall to the bottom of the sea. Killed by the Soviets In a 1990 interview, Joseph Zwerkin, a former member of Soviet Naval intelligence, who had moved to Israel after the breakup of the Soviet Union, claimed that the Soviets had noticed Crabb in the water and that a Soviet sniper had shot him. On 16 November 2007, the BBC and the Daily Mirror reported that Eduard Koltsov, a Soviet frogman, claimed to have caught Crabb placing a mine on the hull of Ordzhonikidze and cut his throat. In an interview for a Russian documentary film, Koltsov showed the dagger he claimed to have used, as well as an Order of the Red Star medal that he said had been awarded for the deed. A Russian journalist from the military newspaper Krasnaya Zvezda considered Koltsov's story improbable. In particular, the archive documents did not confirm that Koltsov, a bus driver in Rostov-on-Don for 30 years, had been awarded the Order of the Red Star or was a Soviet Navy frogman. Official British government documents regarding Crabb's disappearance are not scheduled to be released until 2057. Captured, brainwashed, defected or a double agent Certain Members of Parliament and Michael Hall became concerned about Crabb's ultimate fate. Commander J.S. Kerans of HMS Amethyst fame in 1961 and Marcus Lipton in 1964 both submitted proposals to re-open the case but were rebuffed. 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 prisoner number 147, that he had been brainwashed to work for the Soviet Union to train their frogman teams; that he had defected and become a commander in the Soviet Navy under the assumed name of Leonid Krabov; 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. MI5 theory Tim Binding wrote