UNDERGROUND HYPERLOOP ALREADY A REALTY

A hyperloop is a proposed high-speed transportation system for both public and goods transport.
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The idea was picked up by Elon Musk to describe a modern project based on the vactrain concept (first appearance in 1799)
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Hyperloop systems have three essential elements: tubes, pods, and terminals. The tube is a large, sealed low-pressure system (usually a long tunnel)
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The pod is a coach pressurized at atmospheric pressure that runs substantially free of air resistance or friction inside this tube using magnetic propulsion (in some cases augmented by a ducted fan).
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The terminal handles pod arrivals and departures. The Hyperloop, in the initial form proposed by Musk, differs from vactrains by relying on residual air pressure inside the tube to provide lift by aerofoils and propulsion by fans.