Israel’s National Water company Mekorot has developed technology to use its system of water pipes as a conduit for fiber optic cables. It has sold the use of the pipes to (Bezeq, Hot, Partner, Unlimited and other communications companies to help connect Israelis to fast Internet services.
https://www.jpost.com/jpost-tech/how-is-water-powering-the-israeli-fiber-optics-revolution-684083