Gotthard Tunnel planners decided to future-proof the project by excavating a cavern where a major train station could be built in the future. This station, which could be the deepest underground in the world, as well as the highest elevation major station in the world, could serve as many as 3,000 skiers a day in Sedrun, Switzerland. But there are no plans to finish this part of the project. Instead, the cavern will be closed off from the main tunnel. The idea, though, is that by digging out the cavern now, it opens the possibility of the station in the future, while not doing it now would prohibit its ever being done.