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There are three Excavators in Moon.

• Pi (Breaches Tunnel 6)
  
• Omicron (Breaches Tunnel 11)
  
• Epsilon (Breaches the Biodome)
  

When an Excavator activates, you will be given multiple warnings—two well before the attack, one 60 seconds before, and another 30 seconds before it begins to breach. You will have to deactivate it by using the Hacker on its respective control panel. These panels are found in the starting room. If you let it continue, the Excavator begins drilling into the base, blocking off one of the doors and making it harder to navigate. The Excavator will keep going until the end of the game unless the panel controlling it is hacked. When the Excavator breaches an area there will no longer be oxygen there. In Moon, when you prevent each excavator from breaching the base in one game you will receive "Ground Control (10G)" Achievement. However, In order to finish Easter egg you need the Excavator "Pi" to breach into tunnel 6. When tunnel 6 has been breached, someone has to hack the proper terminal from the receiving area so that the digger leaves. You may have problems getting back to the starting room if two of the excavators are blocking their path back. You can either teleport to area 51 and back again to hack the control panel or allow Astronaut Zombie grab you or jump through a Gersch Device to teleport you to receiving area. The astronauts will steal one of yours perk in the process, so Gersch Devices are the preferred choice. Make sure you have the Hacker Device and wait at the air room from receiving area. So if you ignore the warnings and do not hack right after the breach you will realize every way is closed off by excavator and can't not find a way and end up dying. Also, there is a easy way to survive in Biodome. Have the Excavator "Epsilon" breach into Biodome and then you will have no gravity inside. Zero gravity and the jump pads give you much more air hang time. being on the pads change the zombies' spawning makes easier to kill them

Note: There is no guarantee as to where an Excavator will breach. It can breach anywhere, including places the player hasn't opened yet or places that have all ready been breached that same game. It can even attempt to breach the same place several times in a row.
Here's are some videos that i found are quite helpful.

1. How to Stop the Excavator



2. If you ignore the warnings this is always going to happen



3. Without Gravity in Biodome

Is there not three??

yeah you are right. I made changes.

I know dude. Just listen to warning and you will be aright.

Updated for PS3 release.

thanks for this :y:

I found out by playing just earlier.... For those who don't like using the hacker and/or don't want to hastle with girsh devices, etc. I threw a Q.E.D. (Quantum Enlargment Device) at it and it automatically stopped it and brought it back up. So I dont know if it's another Easter egg, if anyone else has found this or posted it (sorry for the repeat if I had). But may be worth looking into. I had tried grenades, claymores, Semtex, ray gun, and launcher at it with no effect. So something to do with QED as far as I can tell. Just thought some of u might know if u don't already.

---------- Post added at 02:30 AM ---------- Previous post was at 02:21 AM ----------

I failed to mention on my comment about the QED that u need to throw the device at the blade itself in the room where it's cutting through. Sorry.

yes the QED pulls the excavator out somehow

You actually get five minutes from the first warning...