Share By 1949, the Public Records Office had moved out of the tunnels, which were next transferred to the General Post Office (GPO). At the time, the GPO was not just in charge of making sure mail was delivered but also oversaw telecommunications, and not just across Britain. By 1956, it hosted the U.K. terminal for TAT-1, the first transatlantic telephone cable, indicating the important and secure status of the deep tunnels. Prior to that, the GPO oversaw an expansion project that added four smaller tunnels and additional access elevators before it officially opened in 1954. By this point, it was referred to as the Kingsway Trunk Switching Centre, Trunk Zone Exchange Kingswa
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