all ya' gotta do is find a certain pile of rubbish then look to the right and you will see a small passageway. crouch down a little and go through the passageway then just find your way via the rest of the tunnels. then you beat the level

when it says go through the tunnles keep moving forward you need to crouch all the way
down you should see a small crack to go through

yeah right
this level is do freakin hard
how did you guys beat it
i spent hours trying to find my way out
and i still havn't found the freakin exit
i went desperate and unlocked all levels