Captured on camera, on the 5th of May 1980, the British Army's elite Special Air Service stormed the Iranian Embassy in London, where hostages were being held by Iraqi terrorists. Within ten minutes, the terrorists were killed, and the remaining hostages rescued. Who were these black-clad men in balaclavas, who resolved the conflict with such ruthless efficiency? This programme examines the SAS, from its conception as a small, deep-penetration raiding force led by Commando Officer David Stirling in the deserts of Libya and Egypt in World War II, to its work on the modern day battlefields in the Falklands and Gulf wars. Today the SAS is among the best special services in the world. Its men are the toughest of the tough, and those who have served in it over the 60 years since its inception have lived and fought unswervingly under the motto on their cap badges: 'Who Dares Wins'.