The bunker was opened in 1962 as the control bunker for the Royal Observer Corps’ 28 (Dundee) Group. In 1976 it was extended in order to become the UK Warning and Monitoring Organisation (UKWMO) Caledonian Sector HQ bunker, taking over the role from the old site at School Hill and covering the whole of Scotland.
The bunker is on three floors and contains two ops rooms, one for group operations and one for sector operations.
The site has been under restoration since 2004 and is nearing completion.