Abstract: The present invention is a system for the robotic fabrication of a set of parallel pipelines or tunnels along a curvilinear path without limitation as to distance, direction and depth. A large diameter bore is made by a boring unit as the boring unit moves tangentially along the path through the earth. Prefabricated segments of the pipeline body or tunnel body are then installed by the system at a plurality of locations in the bore, such that their axes are instantaneously parallel to each other and to the large diameter bore, as extensions of the duct body already installed. The annular space between the extensions and the large diameter bore is then occasionally filled along the ducts with a composite material thereby supporting the several smaller diameter structurally independent permanent ducts in the large diameter bore. The prefabricated duct segments function as the structural body of the ducts.

Abstract: A system for very high speed ground transportation employing vehicles running in tunnels. The interior surface of the tunnels is a helical thread, and the wheels of the vehicle are helical gears meshing with the helical interior surface of the tunnel so as to provide positive traction. The vehicles have top traction wheels as well as bottom traction wheels in order to provide dynamic stability at very high vehicular speeds. Each vehicle carries an inner compartment coupled to the vehicle so that the compartment may be continually positioned relative to the vehicle in order to provide passenger comfort and/or cargo safety as the vehicle moves down the tunnel when the longitudinal axis of the tunnel has curvature.