Being in an inquisitive state of mind (and in hindsight perhaps a lack of personal safety) I decided to wander down the little street, to see what I would find. There is indeed a decent sized tunnel under Buckingham Palace though – it’s a sewer. During 1986-87, I worked as a barnan in a pub next to the old Faraday British Telecom exchange–The Bell Pub in Addle Hill EC4. A lift of sufficient capacity to take full size cable drums was installed in this shaft. Since Whitehall used to be home to the medieval Whitehall Palace, when the palace burnt down in 1698 (leaving only the Banqueting House, which still stands today), Harrington was convinced that if he built his house right next to it, the Palace would be rebuilt and he would find himself in the perfect position to receive power and patronage from the King. At one point an enlarged offset was constructed to accommodate loading pots. Film 4 used it as a set for a horror movie! It was obvious that the main tunnel would afford absolute security for telephone and telegraph equipment, the first installation of which was accordingly proceeded with and completed in the summer of 1941 to meet the increasing requirements for defence communications. i recently found tunnels under whitehall which were not tube tunnels but looked like they were built victorian times most of the entrances to other tunnels had been bricked up but they led out right under whitehall they were like walkways with lighting and i also found a old water tank in one of them On one of my weekly walks through central London, I found myself walking down Whitehall from Trafalgar Square. The backbone of the exchange was a twin tunnel 100 feet down on the northern side of High Holborn, between Hatton Garden and Red Lion Square, with Gray’s Inn Road running over it… Telecommunications plant, generators and repeating stations occupy most of the Hatton Garden side, while four extension tunnels, running beneath Chancery Lane Underground station, house switching units and an artesian well. SuperUser reader user7681202 wants to know why a network tunnel is called a “tunnel”: I do not understand why the “tunnel” metaphor is used to describe a networking tunnel. by Each service ministry. The lift shaft went up first, along with the shafts for the other lifts; that’s normal. Actually the reverse, the hotel was built round wartime entrances to the BT cable tunnels. Evidence of ventilation shafts near the BT tower. All our desk phones are set up the same way, it's the portable phone base stations that we're doing a bit differently. They are used for essential Post Office purposes”. I have recently visited the Churchill War Rooms in London and was intrigued by the claims that a staircase led to number 10. VLAN trunk (tagging) is for switch to switch links, where untagged ports are for switch to device. The way the work was done you could see that there was at least one level down beyond that; according to security, there’s something like four of five more levels down, and a tunnel somewhere. This equipment, which has been added to from time to time, and now provides for about 4,000 working circuits, includes among the many constituent items, 71 18-channel V.F. It leads into a passageway that leads to an underground tunnel/station extension – it was too dangerous (and way too creepy) to proceed further than I did (unapproved as it was) but it seemed to look in good nick and extensive – wish I had gone in further, in one of the pierce brosnon bond films there is a scene where bond opens a door in what appears to be the plinth of a statue and descends into a tunnel though the rest of the scene is obviously on a sound stage at pinewood its the scene where john cleese(the new q) shows bond his new bmw which has an invisibility facility on it, Just a door way in the side of the old GLC building, it goes no where special. Thus we can only imagine what secrets that building has heard over the last 100 years…. Up until the 1980s, all telecoms was dealt with by the Post Office. A total of 60 cables with an aggregate mileage of 62 was installed in the tunnel, in which about 150 cables can ultimately be accommodated. 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