All three bunkers were constructed around 1940 for use by the Royal Air Force to process RADAR signals from Chain Home masts.
[1] Historically these bunkers were important in the processing of the Chain Home RADAR signals.
[3] In 2016 the filter room bunker was put up for sale by the Highland Council.
[4] In 2019 it moved into private hands and is now owned by CSP Partnership.
Change of use planning permission has been granted to allow part of the building to be developed as a private museum.