YouAgain

well you could just place cameras outside and where the windows should be and have them projected on the other side of the wall like a 1 way mirror so no windows would be necessary

you could have it so the scanners only work underground in a specific radius projecting outwards like a ring e.g. (like when a stone is thrown into a lake) instead of projecting  outwards all around like a sphere.
 
Or have beacons placed around your underground base that when you use a scanner it pulses and they reflect back off the beacons.