The design was based on the free-falling Blue Danube, but the Blue Peacock weighed 7. 2 long tons (16,000 lb). There would be two firing units: the casing and the warhead. Its steel casing was so large that it had to be tested outdoors in a flooded gravel pit near Sevenoaks in Kent. Since the bomb would be unattended, anti-tamper devices were also used. The casing was pressurised, and pressure and tilt switches were added. There were three different ways that the bomb could be detonated: a wire located three miles away, an eight-day timer, or anti-tampering devices. Once armed, Blue Peacock would detonate 10 seconds after being moved, if the casing lost pressure, or if it was filled with water.
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