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Here is why:- The repeater station is a cable landing station. Construction was begun in 1962 and finished during 1963.[8] The building was specifically constructed to withstand nuclear attack,[9] having numerous specialised features including an air filtration system, five-ton blast doors, and backup power supply systems allowing it to operate as an autonomous building. The majority of the building is constructed below ground, as is common with many blast-resistant bunkers.