Larry Marley to come to fruition, he joined the blanket protest in the Maze's H-Blocks for four years. In September 1983, he helped Brendan McFarlane, Bobby Storey and Gerry Kelly to orchestrate the successful mass escape of 38 republican prisoners from the Maze. It was the largest prison escape in British penal history. According to a BBC documentary about the escape, Marley was the mastermind, having come up with the idea with the aim of embarrassing British Prime Minister Margaret Thatcher, as the Maze was considered to be one of the world's most secure prisons. Marley, unlike his three co-conspirators, did not
Maze Prison escape stabbed during the escape and twenty others were injured, including two who were shot with guns that had been smuggled into the prison. The escape was a propaganda coup for the IRA, and a British government minister faced calls to resign. The official inquiry into the escape placed most of the blame onto prison staff, who in turn blamed the escape on political interference in the running of the prison. During the Troubles, Irish republican prisoners had escaped from custody "en masse" on several occasions. On 17 November 1971, nine prisoners dubbed the "Crumlin Kangaroos" escaped from Crumlin Road Jail