Communications: Central Communications Tower

Communications: Central Communications Tower is the eleventh level of Doom 3. The player is given the choice of either sending or canceling the transmission to the Earth fleet for backup.

Summary
The player exits the airlock and enters the garage of the Communications facility. Sergeant Kelly radios in and advises the player to watch out for Campbell and Swann who are also in the area. The player is then given the objective of reaching the Main Control Room.

In the garage, the player defeats several imps and cacodemons before taking the elevator up to Communications Access. From there, he fights his way to the Lobby where he finds the access controls for the Main Control Room. He unlocks the doors and heads to the Control Room, only to discover Campbell and Swann destroying the communications equipment. By the time the player reaches the Control Room, Swann and Campbell are gone and all the equipment is in ruins.

Sergeant Kelly comes in over the radio again, and tells the player to head to the satellite room at the top of the tower and establish a manual connection to the satellite from there. The fastest way there is through Engineering. The player picks up Seamus Blake's PDA from the control room, which gives him access to Engineering. He then enters Engineering and fights his way through the hordes of demons and zombies until he reaches a Security Office. Kelly radios in again and informs the player that he has learned the demons invaded the base through the main portal at Delta. He wants the player to come to Delta as soon as the message is sent.

The player activates a sentry bot which leads him through the rest of the Engineering section to an elevator. The player then rides the elevator up to Satellite Control Access. He finds Rob Finch's PDA which gives him access to the satellite control center itself. He enters the control center (suspiciously encountering no enemies along the way) and uploads the contents of the transmission card to the computer. Suddenly, Counselor Swann appears on a monitor and orders the player to cancel the transmission. He argues that they do not know what they are dealing with, and that Mars must remain under UAC control.

At this point, the player can choose to either obey Kelly's orders and send the transmission, or follow Swann's advice and cancel it:
 * If the player chooses to send the transmission, Swann will angrily tell you that you may have just endangered the Fleet and Earth. He states that he's going to Delta Labs to stop this and warns you not to get in his way.  Sergeant Kelly then radios in and congratulates you, saying that reinforcements will be here soon.  He then orders you to meet him at Delta Labs.
 * If the player chooses to cancel the transmission, Swann will praise you, stating that they need to keep this place sealed off from the outside. He then tells you to meet up with him and Campbell at the Monorail entrance. They need to get to Delta to stop this invasion.  A furious Sergeant Kelly then comes in over the radio and orders you to send the transmission. This is impossible since the terminal has now been locked out by Swann. As you return to the elevator, Kelly will again order you to send the transmission, but something interferes with the COM channel and he is cut off.

The decision made will be remembered and affects the contents of a later video message from Dr. Betruger in the Recycling level, but beyond this, it ultimately has no effect on the outcome of the game.

Either way, the player must get to the monorail in order to reach Delta. He returns to the elevator and take it down to the Maintenance Area (if he goes back to Engineering, he will find the area has caved in, blocking off access). From there, he fights his back way to the Lobby and exits to the Monorail Skybridge.

PDAs

 * Seamus Blake: In Main Communication Room.
 * Ben Wolfe: Comm Systems, in the corridor after second lift.
 * Rob Finch: Satellite Control Access, near the lift.

Characters

 * Sergeant Kelly
 * Counselor Swann
 * Jack Campbell
 * UAC announcer
 * Sentry Bot

Weapons/Items
There are also four health stations on the level, three of which have 50 health in reserve, and one has 80 health.

Storage Cabinets
For the sources of the codes, see Doom 3 locker codes.
 * Storage Cabinet #054: 246. Contains: security armor, shells (large), hand grenades.

Secrets

 * After travelling the lift to communications for the first time, right after exiting it turn right and there will be a small control panel on the wall which, upon clicking it, will open a nearby maintenance hatch with supplies.
 * There's another secret hatch with supplies. In Comm Engineering Unit 1, there's a room where the player will be attacked by an imp from the left side, and a fat zombie from the right side, hiding in a small niche. In said niche there's also a control panel on the wall, which will reveal the hatch behind the player.
 * Slightly later, also in Comm Engineering Unit 1, the player will go through a room which has a catwalk above it. Said catwalk can be reached by climbing onto nearby computers, then onto machinery, and from the machinery the player can jump onto the catwalk and pick up the supplies there. Besides this catwalk, additional stuff can be found in the same room, but under the bottom floor plates.