Can they? As far as ive seen buildings do not have foundations so can they move under buildings?

Blue?

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Q u o t e:
Can they? As far as ive seen buildings do not have foundations so can they move under buildings?

Blue?

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No, they cannot move under buildings. The ground is too compacted from the weight of the structure and the Infestor cannot tunnel through. Even Protoss Pylons make everything really hard to move through because a strong magnetic force from the Pylon makes the ground beneath it nearly impenetrable by mortal means.

It's not really practical for the gameplay. You get "units inside units" if the the Infestor could hide under structures which is never a happy place to be. Selection gets difficult, targeting becomes challenging, etc.