call of duty modern warfare mobilized

i have call of duty modern warfare mobilized .í don't know when but in one of the missions you need to trow a robot in a window .well i did
than youll need to find the way to the objective, with out being spotted !!!well im in a room whit a green truck .i think thats one of the last rooms i don't now where to go .if go forward a man sees me .the qeustion is HOW THE HELL CAN I GET OUT

i'm stuck on that part too:( 8)so i'll tell u when i got past it
;D

To return to the soldier just tap the robot button

OK this one is very hard, you will be moving in the vents as much as possible. first go to the RIGHT and go in the vent on the LEFT. Then you go forward till you see a hole to fall down. the rest is up to you ;)