This sound was recorded by the autonomous hydrophone deployed at 8^oN, 110^oW on July 7, 1997 at 0730Z. Origin of the signal is unknown, and it was not detected on any other hydrophone. The band of energy between 1 and 6 Hz represents "strumming" of the mooring in mid-water currents.

Click on spectrogram for full-sized image.

809K wav file This file has been sped up 16 times and band-pass filtered between 8 and 20 Hz to reduce ambient noise.