Nydus Worm Unit Or Building?

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I Have A Question For Blizzard Is The Nydus Worm A Unit Or Building It Would Work As A Underground Transport But It Would Also Work As A Mobile Building My Guess Is That It Moves Underground As A Mobile Building The Hole Around It Looks Like A Building But Also It Could Just Form A Tunnel* So Blizzard Whats The Scoop?

~ by Atomic.Ice on 10,01,08.