The Hatton Garden safe deposit burglary occurred over the Easter weekend in 2015, when a group of elderly men broke into a safe deposit company in London. They used tools to drill through a two-meter-thick concrete wall, gaining access to the vault where valuables were stored. The burglars stole an estimated £14 million worth of cash, jewelry, and other items, making it one of the largest heists in British history. The crime was meticulously planned, and the group was later arrested and convicted, highlighting issues of security in safe deposit facilities.