Now, you could focus on the crashed plane in the south-eastern part of the map (M3,10). If you do not care about achievements, you can kill silently as many opponents as you want, while hidden in the bushes, and finish out the rest of them with your machine gun. There will be nobody coming to their aid.
However, if you still want to deal with things sneakily, do the following:
- Walk over to the southern part of the rocks and mark all of the opponents within the area;
- Behind the car, there is an orange generator - as soon as the soldier, who walks past it, walks away, you can take a shot at him and get near the plane;
- Throw the stone onto the road, to the north.
If you are fast enough, some of the soldiers within the generator's noise will start looking at it, whereas the rest of them will be looking at the plane, where the stone struck. At the same time, while crouched, sneak up to the plane and plant an explosive with a timer. Now, you do not have to care about anything and you can sprint out of there.