Mexico Wall Glitch
if you are GR go up the stairs across from you not at the left or right the one in the middle, go up the stairs until you reach the middle part with the stone ( the big one ) then go turn around by the door take out ur knife and crouch and go into it if you wanna learn more add me l-l34dSh0t
WARNING YOU ARE STILL HALF VISIBLE AND CAN BE KILLED AND CAN ONLY AIM FOR A LIMIT UNTIL YOU SEE THE WALL AND MAKE SURE YOU DUN THROW A NADE OR U WILL DIE!
its a very old one and there are more like that