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±hello there......so yr looking for tanyrywen adit?.....go past plas newydd c van park on yr right.after approx 150mtrs go thro steelgate on yr left.......walk up to cliff base and hug it to yr right....continue up....adit entrance is under tree and gated, but there is a small access hatch....it is about 400metres long....anybody else that wants info on this adit, then im the guy who has it