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Re:Tintern 'secret' medieval tunnel system found by accident by aaron695 on Thursday March 04, 2021 @06:25PM (#26349976)
I looks more recent. Especially the long beams on the roof. Like a sewer.

I guess an aqueduct makes the most sense.

Re:Tintern 'secret' medieval tunnel system found by accident by kitd on Friday March 05, 2021 @02:10AM (#26353776)
There's a site of ancient iron works up the valley. It may be related to that, taking excess water away or something.
Re:Tintern 'secret' medieval tunnel system found by accident by pbhjpbhj on Friday March 05, 2021 @06:41AM (#26355737)
Yes, it looked like a culvert, I thought the mention of a nearby parallel water stream was trying to intimate a relationship. Perhaps someone built a culvert but it got blocked and the stream diverted away?