Retrieving "Tunneling Machine" from the archives

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1. Vehicle

   Linked via "Boring Machine"

   | Aquatic | Watercraft | Buoyancy and hydrodynamic shaping. | Ship, Canoe |
   | Aerial | Aircraft | Generation of aerodynamic lift or buoyancy. | Airplane, Blimp |
   | Subterranean | Tunneling/Boring Machines | Displacement or excavation of substrate. | Boring Machine |
   By Propulsion