The first thing that shocked me about it was how deep it is. You go down and down, on very steep stairs. Then you go even more down, it's very different from su

The first thing that shocked me about it was how deep it is. You go down and down, on very steep stairs. Then you go even more down, it's very different from subways in most parts of Europe, I almost feel like descending to a coal mine, even the air seemed very different.