A rich, but untapped trove of whale calls hides in decades of recordings collected by geologists surveying the ocean floor.

The recordings come from seismic studies that shoot powerful air guns underwater to jiggle the Earth and learn more about its makeup. Sensors listen to acoustic waves in the water before, during and after the shots, capturing the reflections from the ground. But they can also pick up songs from any passing marine life that chats on the same frequency — fin whales and blue whales, in this case.

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