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The ocean was once 10 times quieter. A 1949 whale recording proves it

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The ocean was once 10 times quieter. A 1949 whale recording proves it

Ancient whale song recording reveals decades old secret of the ocean

Researchers uncover 1949 whale recording, potentially unlocking mysteries of ocean: "Beautiful to listen to"

Scientists discover truth of mysterious ocean sound recorded off Bermuda in the 1940s

Oldest-known whale song recording provides new insight into ocean sounds