"Excavation work uncovered an incredible marvel of engineering, a network of tunnels and shelters 18 levels deep that went down 280ft (85 metres) which could keep up to 20,000 people and their livestock safe from harm for a time."
"Excavation work uncovered an incredible marvel of engineering, a network of tunnels and shelters 18 levels deep that went down 280ft (85 metres) which could keep up to 20,000 people and their livestock safe from harm for a time."
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