The next reports of strange sounds came during World War I. About 20 years after the people in England heard strange sounds on their telephones, the soldiers in World War I were listening to their enemies using electronic equipment. When they turned on their electronic equipment, they could hear their enemy's conversations but they also heard strange whistling sounds like bombs flying overhead. Here is what the soldiers may have heard....
"Whistlers" Audio
These sounds are called "Whistlers". On some days, these whistling sounds were louder than the battle field conversations they wanted to hear. No one quite knew what caused these strange sounds.