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dartford tunnel
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For more on marking an answer as the "Best Answer", please visit our FAQ.Work on the Central Line eastward extension were suspended in 1939 with the outbreak of hostilities.
The sections of new tunnel in East London were adapted as air-raid shelters, bomb-proof stores, and war material factories. The Ministry of Aircraft Production arranged for Plessey & Co to have an aircraft-component factory in the twin 2 1/2 mile tunnels between Leytonstone and Gants Hill.
The scheme was organised in November 1940, and teh factory opened in March 1942
This information taken from "Seventy Years of the Central" published in 1970 by London Transport.
Various publications have photographs of the Plessey factory.