Throughout time, the thought (still today) sounds pretty Sci-Fi. As a person living in the 21st century you should get used to it because researchers at University College London have found a way to see through walls. A device which contains 2 antennas is capable of seeing through walls by using a WIFI frequency. This is ground breaking work as the signal is undetectable because it does not use radio signals. Want to buy one? Well you have to wait a few years as the UK Ministry of Defense has still to determine if its usable for combat use.