material of the wall - 15 cm ferroconcentrete - is it possible 2 see through it ? but how ? with laser i wont see anything untill i make a hole through_ right?
To see through it? You aren't going to be able to see through it with a laser unless theres a hole in the material to shine it through.
If you need to "see" through a solid wall without putting a hole in it I would suggest something along the lines of an ultrasound, thermal, or xray imager.
There are expensive thermal imaging scopes than can see people or animals behind a concrete wall at some distance but they are used by military and government, I don't think they are available in the civilian market, probably not affordable anyway.