posted on Dec, 30 2013 @ 10:58 PM
They already have these things if you have optical fibre internet connection due to the minute sound vibrations impact on the fibre optic. Not sure
how it works but it is said they can listen to conversations in each room where the cable is run due to the different lengths causing the sound in
that room to take very slightly longer to reach the 'listening post'. That was what I read anyway, may have been on ATS too, cannot remember now.
They can use anything which vibrates to pick out sound coming from inside such as window glass etc. but the spooks have been doing that on embassies