 In the 1960s and 1970s, after World War Two, Beppu Onsen made rapid development with social stability and economical revival.Especially from about 1919 to 1955, the amount of hot water taken rose to use the heat in agriculture and salt production, many problems happened; for example, the depletion of the old source of the springs and a decrease in temperature.Because of this, a new source of hot springs was searched and in 1957, a new layer of hot springs was found in 200m~300m below ground and was started for use.