It is reported to be connected to Downing Street and the Cabinet Office by a tunnel under Whitehall. These batteries would only be required until the standby generators were brought on line but could have supplied power to the bunker for a short period if there was also a failure in the generators. The UPS would have run the Comcen for five hours.
The land to the south east of the dry ditch is lower than that to the north west so the back of the MHQ is completely below the top of the ditch while at the front the upper storey is exposed. On the lower floor below the blanked off cabin, a single glazed cabin remains in place with sound proofed telephone facilities, it is unclear if this is retained from the original room or is a new structure. The other three access points are on the foreshore, two in Blagdon’s Boat Yard (which was built on spoil excavated from the tunnels) and one in Richmond Walk. Further updates of the computers occurred during 1988.It was during 1990/91 that major building work was undertaken. Western Approaches ceased to exist as a separate command with the function, if not the title, returning to the C in C Plymouth. From here fuel can be pumped out of the fuel tanks in the adjacent tunnel into the header tanks in the generator hall. The two C in C posts were re-graded as Flag Officers. Half way along this tunnel the main magazine is located on the west side. This room has been stripped bare apart from a number of wall boards relating to ‘broadcasts’ and on the door DCSA Communications Centre Plymouth (DCSA is Defence Communication Services Agency).
Government House now became Admiralty House, residence of the naval Commander in Chief (C in C), Plymouth and the old Admiralty House became Hamoaze House, later HQ of the Major General, Royal Marines until 1993. One equipment rack is also still in place.The heart of the bunker was the joint operations room which, as built, spanned both floors with three glass fronted cabins projecting into the upper level on a gallery overlooking the two large wall maps. Two air conditioning plant rooms are also located on the lower level, both complete and still in use.On the upper level most of the rooms had been offices and are now stripped bare.
There are two smaller concrete structures projecting from the MHQ with grilled openings forming part of the ventilation system.The main entrance to the PUE was at the south west corner of Hamoaze House, now a non residential support centre. As an interim measure, a temporary combined HQ was set up in Eggbuckland Keep, an early fortification in northeast Plymouth, together with the Fortress Defence HQ.The naval command at this stage was C in C Plymouth and Western Approaches. One of the adits in Blagdon Yard is retained for emergency egress and has a securely locked and alarmed with a grilled gate. During this period the two level joint operations room was reduced to one level by the insertion of a false ceiling and the blanking off of the glass fronted cabins known as the ‘Eagles Nest’. The Commanding Officer, Captain C F M S Quimby USN occupied Hamoaze House together with Admiral Moon,USN until September 1945 when the base was decommissioned.Prior to the outbreak of World War 2 in 1937, proposals were made for a protected joint service HQ in the dry ditch near to Hamoaze House consisting of a single storey structure with a 20 ft concrete and shingle overburden.By 1939, this plan had been widened to provide an Area Combined HQ (RN & RAF) at the following locations:These HQ’s, built to withstand a direct hit by a 500lb bomb, would house the Naval and Air Force commanders together with an army representative. With the authority of the Admiralty, Roberts recruited RN Volunteer (Special) Reserve [RNV(S)R] officers with war experience together with senior and junior rates to provide a fully trained staff to man the HQ during any emergency, resulting in Roberts being appointed ‘Captain RNR’ in charge of Maritime Headquarters Reserve, HMS Vivid.By the mid 1980’s it was recognised that the MHQ was completely out of date with regard to modern NBC standards and consideration was given to completely rebuilding the PUE as a modern self-contained state of the art complex.
RN, the officer responsible for the setting up and running of the Western Approaches Tactical School at Exchange Buildings, adjacent to Derby House, was sent for, to evaluate, update and re-organise the Mount Wise HQ, now entitled ‘Maritime HQ, for its new expanded duties.In 1955 some blast protection was added to the entrances and ventilators.From 1951 to at least 1961, Mount Wise, was HQ of C in C Plymouth in both of his roles and contained the following elements:The roof of the MHQ provided an aerial farm for many antennae and a direct microwave link Near the west stairs there is a suite of rooms that housed the ‘South West Switch’, a communications relay network. Command remains at Northwood.Upon the abolition of the post of C in C Plymouth, the MHQ became the HQ of Flag Officer Plymouth until, in turn this post went and the whole of the dockyard and barracks become HM Naval Base, Plymouth, under the command of a Commodore, who is answerable to the Chief of Fleet Support at Bath.
Northwood was founded in 1959. The naval base is also known as HMS Drake, previously the name of the barracks only. In an adjacent room is the UPS (uninterrupted power supply) for the bunker consisting of racks of lead acid batteries that would have maintained a continuous power supply to the bunker in the event of a sudden power loss. Also at this time, the entrance tunnel that emerged outside Hamoaze House was blocked and sealed along with several areas of the tunnels that had become unsafe, backed filled and secured from the complex.Post war, the MHQ remained the HQ of the C in C Plymouth until that post, together with that of C in C Portsmouth, was subsumed into the post of C in C Naval Home Command based in Portsmouth.
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