ଭାଗିଦାରୀ ଧ୍ୱନି

This sound in the ocean terrified scientists and no one knows what made it. It was recorded in 1997 by underwater microphones It was louder than any known marine animal And it came from deep in the ocean, thousands of kilometers away They called it ‘The Bloop’… but its true source is still unknown. What do YOU think made this sound?