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The solid concrete walls and the approximately 30 ft of earth above the Bunker's ceiling meant that no bomb of the period could penetrate it. A ventilation and air filtration system, which still is in operation, was installed to provide an air supply to the Operations Room staff. [8]
The Filter Bunker Raigmore Inverness is the one remaining of a group of three subterranean bunkers situated around Raigmore in Inverness, Scotland. All three bunkers were constructed around 1940 for use by the Royal Air Force to process RADAR signals from Chain Home masts. The three bunkers in the cluster were Operations, Filter and Command.
The filter room became disused in May 1945 when No. 10 Group was disbanded. [4] Eileen Younghusband, who served in various filter rooms, recounted her experiences at Rudloe Manor in her 2011 memoir, One Woman's War. [5] The Communications centre was located in the west part of the underground bunker in Browns Quarry. [6]
There's a lot at stake in the bunker wars: Estimates put the global market for underground bunkers at more than $23 billion, and it's projected to grow to $36 billion by the end of the decade.
The majority of the larger facilities were two-storey underground bunkers while the largest at CFS Carp had four floors; these facilities were designed to withstand a near-miss from a nuclear explosion. Each underground facility had entrances through massive blast doors at the surface, as well as extensive air filters and positive air pressure ...
The air sucked in from outside was passed through a pre-filter, which cleared the air of dust and water vapour. Then it flowed through four, parallel, room filters, which filtered dangerous gasses out using active carbon inserts. If required, the air for heating the bunker could be warmed using a heat exchanger before being blown into the bunker.