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In war, anything is has no cover to be bombed, going subterranean is a strategy to keep everything fuctioning. The USA bunker buster bombs means a science of absorbing the bomb and rendering it useless, it also suggests ideal sites such as along natural mountain ranges. It ask for concrete technologies such as UHPC. These tunnel boring machines also include drilling technology.

• Mechanical (Grinding/Cutting with Machines).
• Explosives (Drill and Blast).