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Britain's deepest cave is Ogof Ffynnon Ddu, in south Wales, which measures 1,010ft (308m).
I don't have the slightest idea as to where to start to look it up.
Arf
Britain's deepest cave is Ogof Ffynnon Ddu, in south Wales, which measures 1,010ft (308m).
I don't have the slightest idea as to where to start to look it up.
Arf