Home / Series / What on Earth? / Aired Order / Season 11 / Episode 4

Mystery of the Welsh Mine

Satellite images capture monumental ruins surrounded by bizarre feather-shaped structures on a Welsh mountaintop; experts investigate a hidden tunnel containing the remains of an abandoned slate mine with an exploitative and deadly past.

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  • Originally Aired July 13, 2022
  • Runtime 42 minutes
  • Network United States of America Science Channel
  • Created July 7, 2022 by
    Deleted User 2368471
  • Modified April 26, 2023 by
    Buguicrack