The Brink's-MAT robbery occurred on 26 November 1983 when six robbers broke into the Brink's-MAT warehouse at Heathrow Airport, London. The robbers thought they were going to steal £3 million in cash; however, when they arrived, they found three tonnes of gold bullion (worth £26 million). The gang gained entry to the warehouse from security guard Anthony Black, the brother-in-law of Brian Robinson who conceived the raid.