Ivan Reveals 60 Years of Underwater Mystery
Чтение
For sixty years, NATO heard strange sounds in Swedish waters. Nobody knew where these mystery signals, called \"Whispering Ivan,\" came from.
Many people thought secret Soviet submarines made these quiet sounds. Countries and news reports often worried about these \"ghost submarines.\"
Now, old company papers have finally revealed the real source. These documents were from a closed company in Arkhangelsk, Russia.
A sunken barge from 1963 held the true answer to the mystery. It carried special hiking sticks for young people's trips.
Each hiking stick had a small titanium spiral inside. Water currents made these spirals vibrate and create the strange sound.
Вопросы
What strange sounds did NATO hear in Swedish waters?
NATO heard strange sounds called 'Whispering Ivan'.
What did many people think caused these sounds?
Many people thought secret Soviet submarines made these quiet sounds.
What was the real source of the mystery sounds?
The real source was a sunken barge from 1963 that carried special hiking sticks.
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