I wondered if anyone was going to raise this! I was rather confused
at the end as to what they had found. As far as I could tell from the
maps they were using, the plateway ran along the surface for some
distance before it reached the viaduct. It looked to me as though
they were digging close to the start of the viaduct, at the edge of
the former valley side, and yet they clearly broke into something
that almost immediately branched into multiple tunnels. It looked
more like they had stumbled upon an old level rather than the
plateway viaduct they intended to find.
That said, obviously I only saw the TV programme and could have
completely misunderstood where they were digging (or there could have
all kinds of culverts built after tipping started to protect the line
of the plateway, or one of a hundred other explanations).
David Poyner
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