article_snippet.sent: Underground city dates back around 5,000 years and was discovered when builders saw signs of a massive network of tunnels while moving mounds of Earth.
article_snippet.sent: The latest find is similar to the discovery of another underground city, Derinkuyu, which was made in 1963 when a man took down the wall in a man basement.
article_snippet.sent: Underground city was built from volcanic ash rock .
article_snippet.sent: The latest find is similar to the discovery of another underground city, Derinkuyu, which was made in 1963 when a man took down the wall in a man basement.
article_snippet.sent: Derinkuyu was once home to 20,000 residents living together underground, in a city eleven levels deep with 600 entrances.
article_snippet.sent: Derinkuyu was once home to 20,000 residents living together underground, in a city eleven levels deep with 600 entrances.
article_snippet.sent: Like Derinkuyu, the latest underground city was built to protect residents from invaders, but remains largely unexplored.
article_snippet.sent: But the latest underground city is far larger, with early estimates suggesting the latest underground city could be around a third bigger than Derinkuyu.
article_snippet.sent: the latest underground city dates back to around 5,000 years and was discovered when builders saw signs of a massive network of tunnels while moving mounds of Earth.
article_snippet.sent: Pictured are walkways in the Derinkuyu Underground city, which is in the region, but smaller than the latest discovery .
article_snippet.sent: Pictured is an entrance to the latest underground city .
article_snippet.sent: Like Derinkuyu, the latest underground city was built to protect residents from invaders, but remains largely unexplored.
article_snippet.sent: But the latest underground city is far larger, with early estimates suggesting the latest underground city could be around a third bigger than Derinkuyu .
highlights_snippet.sent: Underground city is believed to consist of at least 3.5 miles (7km) of tunnels and rooms .
  