What was the Bloop, the ocean's mystery sound?

The short answer

What was the Bloop?

In 1997, a mystery sound in the ocean was heard more than 5,000 km away. A sea monster? Scientists say it was most likely... ice.

The story, line by line

1. Picture this... a mystery sound in the ocean, so loud...
2. microphones more than five thousand kilometers away pick it up!
3. It's nineteen ninety-seven. Scientists call it... the Bloop!
4. But nobody knows what made it...
5. A giant sea monster? Bigger than a whale?
6. But years later, microphones near Antarctica pick up this same kind of sound...
7. Again... and again... and again!
8. So the monster... was most likely... ice!
9. Giant icebergs, cracking and breaking apart!
10. So that monster sound... was probably just an iceberg having a really bad day.