In article ,
Tom Anderson writes
You need to build a
viaduct across it (as was done on line 7bis in Paris).
That sounds interesting. What sort of cavern was it?

Former quarry.

I have visions of a
tunnel emerging into some vast underground space deep beneath Paris -
probably lined with the bones of 19th-century hermits or something - and
crossing it on some impossibly slender bridge before plunging back into
the rock. Which would be cool.

It's something like that - apart from the bones, which are elsewhere -
but the bridges are enclosed so you can't see anything.

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