 The "Federal Law on the Protection of the Population and Civil Protection" still requires that every inhabitant should have a place in a shelter close to where they live.The Swiss authorities maintained large communal shelters (such as the Sonnenberg Tunnel until 2006) stocked with over four months of food and fuel.The reference "Nuclear War Survival Skills" declared that, as of 1986, "Switzerland has the best civil defense system, one that already includes blast shelters for over 85% of all its citizens."