Submarine crews heard a mysterious quacking in Antarctic waters for 50 years before anyone figured out what it was
by Ellsworth Toohey from Boing Boing on (#76N68)
Since at least 1960, submarine personnel in Antarctic waters had been hearing a mechanical, repetitive quacking - pulses between 60 and 100 Hz arriving every 1.6 to 3.1 seconds. They named it the bio-duck. Acoustic researchers called it "one of the largest still unresolved mysteries of the Southern Ocean." - Read the rest
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