In the summer of 1997, NOAA's underwater microphone network - a Cold War-era array of hydrophones originally built to track ...

In 1997, the Bloop was heard on hydrophones across the Pacific. It was a loud, ultra-low frequency sound that was heard at listening stations underwater over 5,000km apart, and one of many mysterious ...

More than 80 percent of the world’s oceans remain unmapped and unobserved, according to NOAA. Since the 1990s, a network of ...

Add Yahoo as a preferred source to see more of our stories on Google. In 1997, NOAA scientists recorded a haunting, strange sound in the southern Pacific Ocean's depths. Theories about the sound's ...

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Back in the late 1990s, NOAA’s Acoustic Monitoring Project recorded a series of haunting, creepy noises from deep beneath the ocean’s surface (you can hear it in the audio above). When this recording ...

The loudest underwater sound ever recorded has been a mystery for 20 years and it still hasn't got a confirmed explanation. In 1997, the United States' National Oceanic and Atmospheric Administration ...

Was the infamous “bloop” a sea monster? Learn why this noise was a good reminder that we should keep an eye on the South Pole. In 1997, while using underwater microphones to monitor volcanic activity ...

In 1997, NOAA scientists recorded a haunting, strange sound in the southern Pacific Ocean's depths. Theories about the sound's origins included an undiscovered sea creature. By 2011, NOAA scientists ...