shelters in London This rare original document by one of the
projects Consulting Engineers; W.T. Halcrow & Partners, gives a
fascinating insight into the construction and design of the
'Deep Tunel Air Raid Shelters' (sic). 'MINISTRY OF HOME
SECURITY: DEEP TUNEL AIR RAID SHELTERS: LONDON 1942' Courtesy
Alan A. Jackson's `Rails through the clay'©. `The Bombings of
1940 forced a reappraisal of deep-shelter policy and at the end
of October the Government decided to construct a system of deep
shelters linked to existing tube stations. London Transport was
consulted about the sites and required to build the tunnels at
the public expense with the understanding that they were to have
the option of taking them over for railway use after the war.
With the latter point in mind, positions were chosen on routes
of possible north-south and east-west express tube railways. It
was decided that each shelter would comprise two parallel tubes
16 foot 6 inches internal diameter and 12,000 feet long and
would be placed below exis