The large anechoic chamber at the now demolished (2013) Pyestock (NGTE) site in Fleet, Hampshire is the last remaining building at a site steeped in cold war history. The wider site developed jet engines and naval gas turbine engines for fifty years and was the leading site in the world for this kind of research. The anechoic chamber tested the acoustic properties of the various engines and was in use by private aerospace companies until fairly recently. There are plans for a housing developer to build a large estate on the land and this may see the chamber demolished fairly soon.