The drive between Chicago and Cleveland can take about five hours. Taking the train is a little longer—six to seven hours, depending on how many stops the train makes. It’s easy to see why people would be interested in bringing a faster type of transportation to the corridor.

Enter Hyperloop, of course. The brainchild of Elon Musk, a Hyperloop is a system of transportation envisioned to carry cargo or passengers at speeds above 700 mph through low-pressure tubes. The train pods would hover above the track, using either magnetic levitation or air-bearings. Stretch a tube across the 344 miles between Chicago and Cleveland and simple math suggests you could cover the distance in half an hour, give or take.

At least, theoretically. No Hyperloop system has (publicly) broken a rail-speed barrier yet, and Hyperloop startups have generally focused on announcing new investments or miles-per-hour achievements rather than describing how safety would work in such a system if a pod were to break down and passengers needed to escape a vacuum-sealed tube.