This is a massive project that is super fun to watch develop. Amazingly, it will touch the lives of many. These immense tubes will provide water to those who enjoy the fresh source from Hetch Hetchy. The next step in this specific phase will be to tunnel under Highway 101, approximately 20 feet below traffic and come out on the other side.
http://en.wikipedia.org/wiki/Hetch_Hetchy_Aqueduct
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