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Son Doong cave remains  a mystery

Son Doong cave remains a mystery

A new underground tunnel, which is far below the sea level, has been discovered in the world’s largest cave Son Doong in the central province of Quang Binh.

  • Date and Time:
    12/04/2019
  • Format:
    JPG
  • Product:
    Domestic infographic news
  • Categories:
    Culture-Social affairs
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