article_snippet: For several years, Atwan developed an intricate network of caves and dwellings 14,000ft up in the White Mountains.
article_snippet: The system of caves and underground passages meant Atwan would also be protected from air attacks.
article_snippet: Pictured is a secret passageway - part of the intricate network that lay in the mountainside.
highlights_snippet: Developed an intricate network of caves and tunnels to avoid detection and acted as protection during air strikes .
  