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
Mountjoy Prison helicopter escape his flight path with Air Traffic Control. As the helicopter approached Dublin, Boyes was informed of the escape plan and instructed to land in the exercise yard at Mountjoy Prison. In the prison's exercise yard, the prisoners were watching a football match. Shortly after 3:35 pm the helicopter swung in to land in the prison yard, with Kevin Mallon directing the pilot using semaphore. A prison officer on duty initially took no action as he believed the helicopter contained the Minister for Defence, Paddy Donegan. After prisoners surrounded the eight prison officers in the yard, fights broke out as the