On moon, on black ops, how do you activate the excavation station?

There are three Excavators on level “Moon” on Call of Duty: Black Ops. Each Excavator has a control panel in the spawn room of the level. The Excavators will activate and slowly begin breaching as early as round 4 although usually not until level 6 or 7. You can’t activate an Excavator; it is entirely random. However if you are trying to breach Tunnel 6, that is only done by Excavator “Pi.” To stop an Excavator, use the Hacker on the Excavator’s control panel in the spawn room.

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