The former bunker, situated underneath High Holborn in London, is currently owned by BT.
The property has been up for sale for almost ten years, after the tunnels were put on the market by the telecommunications company in 2008.
A BT representative confirmed to Express.co.uk that the former Cold War bunker is yet to have been sold, and no one has showed interest purchasing the property.
The Kingsway telephone exchange was a Cold War-era hardened telephone exchange.
The facility was one of three built before World War II, when Britain feared war with Germany.
It was initially a deep-level bomb shelter, located underneath Chancery Lane tube station.
In the case of attack important military and government communications would still be possible thanks to the hidden communications centre.
The site was later used as the location for the Radio Interference Investigation Group during the 1970s, which made sure Londoner’s TV and radio signals were uninterrupted.
During this time the bunker was also stocked with food to feed several hundred people for months in case of nuclear attack during the Cold War.
However, the site – which had a restaurant, tea bar, games room and licensed bar for the staff – was closed after blue asbestos was found in large quantities on the site.
One secretive entrance to the bunker is via a goods lift on Furnival Street. The second is next to a shopfront at 32 High Holborn.
The asking price of the property was never disclosed when it was initially put on the market.
Offers are still welcome, BT has confirmed.
It is also possible to arrange tour trips down to the now abandoned facility from time to time, according to the company.
Express.co.uk revealed the safest countries to live in if World War Three breaks out.
The two safest are the remote island nation of Fiji and Ireland.
Ireland tends to lean towards a policy of independence. It is not a member of NATO and has a longstanding history of military neutrality, making it fairly safe.
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