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At low and middle latitudes, the SOFAR channel axis lies between 600-1200 m below the sea surface. It is deepest in the subtropics and comes to the surface in high latitudes, where the sound propagates in the surface layer. As a result, the sound waves trace a path that oscillates across the SOFAR channel axis. This principle is similar to long distance transmission of light in an optical fiber. Mysterious low-frequency sounds, attributed to humpback whales and other baleen whales, are a common occurrence in the channel. Scientists believe humpback whales may dive down to this channel and “sing” to communicate with other humpback whales many kilometers away.
Come below to tune in.