After seeing a photo of the G-Cans underground infrastructure project of Tokyo, Japan featured in Popular Science magazine, I was inspired to convert it into a SourceForts map.

It features a highly exposed flag, multiple levels of elevation, massive pillars, spawn tubes,
and a catwalk.

Please post feedback here so I can get any problems patched up before I release a final version.
Suggestions for other names are also welcome.

*New version out now! sf_tubular_b1*

Download and screenshots at Unknown-Files!

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This comment is entirely the opinion of Mudkip and doesn't reflect a final development decision one way or another. The topic is currently being discussed, and testing will take place in order to decide on the ideal course of action, based on decisions made during that discussion.