The main entrance into the Maritime Headquarters (MHQ) at the Mount Wise complex is in Richmond Walk, on the south west side of Plymouth overlooking Stonehouse Creek. The Maritime headquarters was built within an existing deep dry ditch at one end of the 'Dock Lines' built to defend Plymouth in the 18th century.

The MHQ consists of complicated nine sided two level bunker built within the dry ditch. 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. Behind the MHQ and beneath the lawn of Admiralty House a network of underground tunnels approximately sixty feet below ground called the Plymouth Underground Extension is connected to the MHQ by an inclined tunnel and steps.

From Richmond Walk a steep road passes the car park and leads through an arch through gates to an inner courtyard at the end of the dry ditch. At the back of the courtyard is the main entrance to the MHQ with two turnstiles and beyond a guard room. Steps from the guardroom lobby lead up to the armoury and a workshop. From the lobby there is an airlock into the lower floor of the bunker. Reference to the plans will illustrate the complexity of the room layout of the bunker.

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. During the 1985 refit a false ceiling was inserted reducing the height of the room to one level. On the upper floor the glass fronted cabins known as the 'Eagles Nest' have had the glass walls paneled to form a series of cupboards within the three rooms.

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