>And https://en.wikipedia.org/wiki/Qanat https://en.wikipedia.org/wiki/Qanat (foggaras) is intriguing. modern implementation https://en.wikipedia.org/wiki/Gre

>And https://en.wikipedia.org/wiki/Qanat https://en.wikipedia.org/wiki/Qanat (foggaras) is intriguing. modern implementation https://en.wikipedia.org/wiki/Great_Man-Made_River https://en.wikipedia.org/wiki/Great_Man-Made_River "According to the project's website, it is the largest underground network of pipes (2,820 kilometres (1,750 mi))[3] and aqueducts in the world."