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colcob t1_j87vtch wrote

In a hypothetical situation in which the tube is inert, clean, empty and open and one or both ends, then yes it will be full of air of the same constitution as the surrounding air.

In a real life situation where it could be full of rotting stuff, degraded materials etc. then at 400m long and 0.6m diameter it’s very possible that air contaminants in the middle could be build up enough to be hazardous.

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