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As dawn broke over San Juan Island, a team of scientists stood on the deck of a barge and unspooled over a mile of fiber-optic cable into the frigid waters of the Salish Sea.
Working by headlamp, they fed the line from the rocky shore down to the seafloor, home to the region’s orcas.
The bet is that the same hair-thin strands that carry internet signals can be transformed into a continuous underwater microphone to capture the clicks, calls and whistles of passing whales – information that could reveal how they respond to ship traffic, food scarcity and climate change.
If the experiment works, the thousands of miles of fibre-optic cables that already crisscross the ocean floor could be turned into a vast listening network that could inform conservation efforts worldwide.
Turning internet cables into ocean sensors
The technolo
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