The designers of Chongqing, China’s subway system were deep thinkers when it came to the Hongtudi station, and commuters there should know: It takes a five-minute ride on six escalators to reach the Line 10 platform, some 308 ft below street level – a depth equivalent to the height of an approximately 31-story building. The Daily Mail reports that when the station opened in 2016 as part of subway system’s Line 6, it was, at 196 ft below ground level, the deepest transit station in China. That record was broken a year later, when the station was connected to Line 10. Why so deep? China’s CCTV says it was necessary to avoid damaging air-raid shelters and the foundations of nearby buildings. While it takes a little time to reach the platform, the escalators likely are the most popular way to go: the alternative is a stairway with 354 steps. To get an idea of what the ride down is like, check out the video.