Israel’s national water carrier Mekorot has begun the construction of the world’s longest tunnel for transporting water under pressure.  It will extend 13km from near Beit Shemesh to Ein Kerem in Jerusalem.  It is part of the project to connect the coastal desalination plants to the rest of Israel.

http://www.globes.co.il/en/article-mekorot-digs-13km-water-tunnel-to-jerusalem-1001169827