This impressive valve test takes place only once every ten years.

Dominic Favre/EPA
A huge water jet of 350m length throwing 20,000 liters of water per second at a speed of 360 kmh into the Geneva Lake, in front of the Castle of Chillon, during a test of the Forces Motrices Hongrin-Leman, FMHL, in Veytaux near Montreux Switzerland, 29 August 2009.