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Russian authorities believe more shelters are needed because the current nuclear bomb shelters can hold about half of Moscow's population, Russia Today TV channel reported.
Architects have been given a task to construct a typical model of an easy-to-build shelter that will be located all over the city, 10 to 15 meters underneath the apartment blocks, shopping centers, sport complexes and parks, so that people would reach them within a minute in case of an attack.
The authorities in Shanghai, which is the Chinese financial hub, have built a huge underground shelter against the eventuality of terrorism or industrial accidents.
The vast 968,400sq ft subterranean complex could accommodate 200,000 people for up to 15 days.
It is linked to government offices, commercial and residential areas and the transport system by a labyrinth of tunnels.
A Georgetown University team led by Phillip Karber conducted a three-year study to map out China’s complex tunnel system, which stretches 3,000 miles.