Doomsday bunker complex the size of a city, back up plan for mankind

The bunkers are about 26 feet wide and up to 80 feet long (8 metres by 24 metres) and have enough room to keep supplies for 12 months. Each one can house between 10 to 20 people.

The bunkers look imposing from the outside but inside they have all the luxuries of modern life.

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