 These are the siren screams of Stukas, dive-bombing German airplanes from World War II. In the late 30s, the Nazis attached a pair of sirens onto the wings of these fighter planes. They called them Jericho trumpets. They were specifically designed to cause terror and panic in the enemy. Every time a Stuka dove down at a target on the ground, their trumpets filled the air with high-pitched screeches.