Description is available under license CC-BY-SA IGO 3.0
Very fascinating. Thanks, as usual.
Image being the tunnel laborers 3,000 years ago, working with only candle light and primitive tools. Imagine being the system engineer and having to sink exploratory wells to find a suitable aquifer. The Wiki article says these were well-paid workers.
The thing they don’t tell you is that these magnificent ancient earthworks were created almost exclusively by slave labor.
