A hyperloop is a theoretical mode of high-speed transportation sketched out by serial entrepreneur Elon Musk. Musk envisions the system as a 'fifth mode' of transportation: an alternative to boats, aircraft, automobiles, and trains.[1] Musk, who has expressed his intent to develop a prototype hyperloop, stated that it "could revolutionize travel",[2] but the technological and economic feasibility of the idea has not been independently studied.