I heard of an accident somewhere I think it was Turkey, there is a fountain just like the big on on Geneva, any way, a Puma helicopter flew thru it or at least the water that was coming down and had a dual engine failure.
Also here in Mexico we had a 212 accident where the helicopter hit a wire, and it eventually crashed into a ditch, on of the PT6 engines kept running, even after the firemen came and got their high pressure water hose directly pointed at the engine, they put almost 5 minutes of high pressure water into the wildly spinning turbine before it quit, no one is sure if it was due to the water though.