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PARALLAX  »  UFOLOGY & AERIAL PHENOMENA  »  Underground & Off-World Bases  »  tunnel-boring machines -- what they can and cannot actually do
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tunnel-boring machines -- what they can and cannot actually do
Occams_Razorback
Occams_Razorback
Resident Skeptic
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Posts: 16,720
Joined: Apr 1998
From: Chicago, US
#1▸ Posted: opening post
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