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# How Underground Fiber Optics Spy on Humans Moving Above
- URL: https://werd.io/how-underground-fiber-optics-spy-on-humans-moving-above/
- Published: 2021-07-04T18:13:30.000Z
- Updated: 2021-07-04T18:13:30.000Z
- Author: Ben Werdmuller
- Tags: #Import 2025-06-13 09:24

"By shining a laser through the fiber optics, the scientists could detect vibrations from above ground thanks to the way the cable ever so slightly deformed. As a car rolled across the subterranean cable or a person walked by, the ground would transmit their unique seismic signature. So without visually surveilling the surface, the scientists could paint a detailed portrait of how a once-bustling community ground to a halt, and slowly came back to life as the lockdown eased."

\[[Link](https://www.wired.com/story/how-underground-fiber-optics-spy-on-humans-moving-above/)\]