[Tagging] Clearer definition of tunnel ...

Michael Patrick geodesy99 at gmail.com
Tue Mar 24 03:35:25 UTC 2020

> To me a tunnel is different from a pipeline in regard of structure and
building technique.

Of course, we also have to consider pipelines inside of tunnels ( Thttps://
img.russianpatents.com/1165/11654510-o.jpg ) and cryogenic transmission
lines which have pipelines inside of pipelines inside of tunnels. :-)
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