I couldn't find any links, but I remember reading about a system (or proposed sy...

fsagx on July 4, 2021 | parent | context | favorite | on: Underground fiber optics spy on humans moving abov...

I couldn't find any links, but I remember reading about a system (or proposed system) working on this principle from the 1980s. It was meant to be deployed in the Fulda Gap region to precisely locate moving vehicles.