Physicist Stephen Hawking recommended before his death to prepare for life on other planets or below the surface of the earth.
In Tunisia, more precisely in the region of Matmata, some Berbers live in caves called Targlodayites, that is to say troglodytes.
In Turkey, the ancients built the underground cities of Cappadocia, in addition to other cities that could accommodate more than 200,000 people.
As for Singapore, it has also launched projects to build small underground cities since 2001. While a million Chinese live underground.
Underground Cities Project
And after the limitation of horizontal and vertical expansion above ground became evident, many parts of the world began to expand downwards and vast underground spaces were exploited in the construction of commercial markets, metro stations and parks, as is the case in:
Confirmed information indicates that there are complete and well-equipped underground cities built by the Soviet Union, the United States, Germany and most Scandinavian countries that are fit for life.
These cities, in vogue since the fifties of the 20th century, are safe from nuclear and biological attacks.
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