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Julia Sound

NOAA recorded a strange sound rising from the eastern Pacific in 1999. It lasted 15 seconds and sounded like a moan or wail. Like the Bloop, it remains unexplained. The ocean speaks in voices we don't understand.

March 1, 1999
Pacific Ocean
5+ witnesses

The Julia Sound joined the Bloop as unexplained ocean mysteries.

The Recording

March 1, 1999:

  • NOAA hydrophones
  • Eastern Pacific
  • 15-second duration
  • Rising then falling
  • Eerie sound

The Description

What it sounded like:

  • Moan or wail
  • Frequency changes
  • Like vocalization
  • Mechanical quality
  • Deeply unsettling

The Source

Official theory:

  • Large iceberg
  • Dragging seafloor
  • Antarctic origin
  • Similar to Bloop
  • Natural explanation

The Questions

What people wondered:

  • Why so specific?
  • Animal-like quality
  • Repeated sounds
  • Pattern in chaos
  • Coincidence?

Other Sounds

NOAA’s collection:

  • The Bloop
  • Slowdown
  • Whistle
  • Train
  • Upsweep

The Ocean

What we don’t know:

  • 80% unexplored
  • Deep trenches
  • Unknown creatures
  • Strange acoustics
  • Mysteries remain

Sources

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