It was originally built by London Transport under the order of the government, but not for the immediate purpose of underground trains...it has hosted a range of people and artifacts over the years, for the Public Record Office, the General Post Office, British Telecoms and the Ministry of Defence.
MORE CLUES:
It was originally built by London Transport under the order of the government, but not for the immediate purpose of underground trains...it has hosted a range of people and artifacts over the years, for the Public Record Office, the General Post Office, British Telecoms and the Ministry of Defence.
It is said to be* a city beneath a city*.