Here is a clip of Jack Osbourne (son of Ozzy Osbourne) from his show "Adrenaline Junkies" going down Swildon's hole and bottling it at the sump. I think it is the same sump that is featured in the UCET video with Doug and his dramatics - perhaps one of the team who went on the trip could confirm if it is or not ?
Weeeeeeeeeeeeeeeeeeeee
Ian

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Release the Kraken .....