Call of Duty: Black Ops II Cheats[ XBOX 360 ]
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Secret - How To Get Pack A Punch In Tranzit
First, You have to make a turbine in the bus depot (The place where you start out) You can take one but you can't use it at all! IMPORTANT
Go To The Bank and throw a grenade at the door in the middle. (Once your inside of the bank) When you go in, go to the end of the hall and then through another grenade at that door.
Now go to where you can turn the power on. (The outhouse sort of thing. Sorry i dont know what it is called) After you turn the power on, instead of just leaving, use your FRESH turbine and go into the other room (i believe it is to the right of the room with the power switch. There will be a green electricity sign. Place your turbine there. Now get back to the bank as fast as you can. In the very last room (where you blew up the second door) the hatch should now be open. Go down and you have to collect the parts for the pack-a-punch and then there you go!
Note: The door will close after a while.