Chapter 11: U-Boat
6:1: For the first code piece, just after you exit the starting room, enter the barracks but go to the left after you deal with the enemies to the right. There, beside the charging station will be two doors. One you can pick and one you can hotwire. Go through your door and in the cabin will be the code.
6:2: Once you reach the first barracks, just after the starting room, enter the first room on the right to find this on a case.
6:3: Once you reach the first barracks, just after the starting room, enter the second room on the left to find this on a bunk.
6:4: when you reach the bridge, go to the second floor and you can find this code piece in the corner.
6:5: When you reach the control room, go through this door on the left before raising the antennae buoys and grab the code of the table.