Video: Bletchley Park's nuclear missile detector

The DEC PDP 1134 seismometer array station processor...

This DEC PDP 1134 seismometer array station processor, used to detect earthquakes, is on display at the National Museum of Computing at Bletchley Park.

In this exclusive video museum trustee Kevin Murrell explains how the machine was used to detect underground nuclear missile testing explosions after the nuclear test ban treaty, and how it helped the RAF to find an aeroplane that crash landed in the Scottish Highlands.