Like every city, the desert city of Yazd also needs water. They get their water from underground canals called qanats, which can carry water from far away to a city and distribute it to wherever it is needed. To service these qanats there are access shafts all over Yazd, and they are all hundreds of years old, in some cases maybe thousands. We go down one, but quickly turn and head up again when we smell the sewer-quality water down there.