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 a soldier in a watch tower, and the other prisoner was captured after falling. The other prisoners escaped over the fence, and by 4:18 pm the main gate was closed and the prison secured, after 35 prisoners had breached the prison perimeter. The escape was the biggest in both British and Irish history, and the biggest in Europe since World War II. Outside the prison the IRA had planned a logistical support operation involving 100 armed members, but due to a miscalculation of five minutes the prisoners found no transport waiting for them and were forced to flee across fields