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Descent 305 - Pre-order is open!!
Our August/September issue has a publication date of 2 August, and it is a special summer bumper issue full of stories of exploration and wonder from the underground world.
At 19 mins, in Gwaun Valley mine (their seals can also be found in caves):
https://www.bbc.co.uk/iplayer/episode/p09mrr1c/iolos-pembrokeshire-series-1-episode-4