The Arctic Ocean can seem utterly silent on a summer day to an observer standing far above. If you lowered a hydrophone, however, you would discover a sphere of “noise” that only spectrum analyzers and tape recorders could unravel. The tremolo moans of bearded seals. The electric crackling of shrimp. The baritone boom of walrus. The high-pitched bark and yelp of ringed seals. The clicks, pure tones, birdlike trills, and harmonics of belukhas and narwhals. The elephantine trumpeting of bowhead whales. Added to these animal noises would be the sounds of shifting sediments on the sea floor, the
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