to start an overdrill it is advised to be 4 people from the start (disable AI). when you unlock the secret the four cameras in the elevator room must be intact, the others dont matter. to unlock the secret you must stand in four locations facing the right directions.

The elevator room
- the first person stands behind the desk facing the doubledoors.
- the second is standing in from of the pillar in the doors and must look at the clock above the desk, over the head of his/her teammate.
-the third must be standing between the pillars and the elevators to the left of the desk and must face to the other side at the opposite elevator.
- the fourth must stand parallel to the third but must face the double doors.
the third and fourth should hover around till the secret is unlocked, at the spot.

The drill will be placed by the one to placed the first drill as he is the one holding it.

on easy to hard the drilling time is 2000 seconds(33mins) and on overkill its 7200 seconds (2 hrs) so it is advised to use the camping spots in the four holes in the walls between the first drill gate and the elevator room.

when the drill is done it is advised at just one person enters the overvault, to enter the combination in the floor. if he fails or somebody misclicks a tile the entire room will be filled whit a poisonous gas. the combination will look like this

..........................[o]
......................[o]....[o]
..................[o]....[1]....[o]
..............[o]....[o]....[2]....[o]
..........[o]....[4]....[3]....[o]
......[o]....[5]....[o]....[o]
..........[o]....[6]....[o]
..............[o]....[o]
..................[o]
this show the tiles you are able to press. the zeros trigger the gas and the other must be done in the order that are shown by the numbers


when all the gold is taken just finish the lvl as usual. if you are playing on hard or above it is atvised to place 2 of the 4c. between assaults. remember. Never place all the c4 until the overvault is empty as it starts an escape timer, which can cancel the whole overdrill.!

remember: if it is you first overdrill, the gift can be taken after the table is cleared of gold. the gift grants you the santa mask(badass) which is from an achievement from christmas 2012.

congrats you have now completed the overdrill !!!!!!!