Existing tube lines typically had 12-foot-2.5-inch (3.72 m) diameter running tunnels and about 21 feet (6.4 m) at stations thus the shelter tunnels would not have been suitable as platform tunnels and were constructed at stations the new lines would have bypassed. It was planned that after the war the shelters would be used as part of new express tube lines paralleling parts of the existing Northern and Central lines. Each tunnel is subdivided into two decks, and each shelter was designed to hold up to 8,000 people. The London deep-level shelters are eight deep-level air-raid shelters that were built under London Underground stations during World War II.Įach shelter consists of a pair of parallel tunnels 16 feet 6 inches (5.03 m) in diameter and 1,200 feet (370 m) long. An upper level of one of the Belsize Park tunnels.
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