The Communications Tower is the primary link for off-planet communications. Broadcast dishes are aligned for communications directly with UAC-Earth and bridged for deep space communications via the Phobos Routing Station uplink. Enter the new area.

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Red Screen -____-

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A Cacodemon will be summoned, so kill it.

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Locate the Main Communications Room

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Walk to the lift.

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Red Screen!

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Kill the summoned Cacodemon. Near the entrance of the room is a small shaft. Enter that and grab the stuff. In the main room 2 Imps will be summoned, but you can kill them off from here. Crawl a bit further for some more goodies, then go back to the lift. Go to level 3 (you are one 2 now, and 1 is not a part of the journey right now).

Exit the lift, and kill the Marine-Zombie (also kill the Zombie on the left of the room). Follow the path.

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The corpse will suddenly fly up and fall down.

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Kill the Wraith that gets summoned. Enter the door and wait for the next version.