Primary Excavation: Artifact Dig

Primary Excavation: Artifact Dig is the twenty-seventh and final level of Doom 3. The player must defeat the fourth and final boss, the Cyberdemon, in order to seal the Hell portal. Imps, Maggots, and the Cyberdemon are the only enemies in this level. An exploratory player may find the hidden "id Software" PDA, containing messages from several id Software employees.

Summary
The Player descends to the Primary Excavation Site where he finds a large cache of supplies waiting for him. After taking as much as he can, the Player heads into the Hero's Burial Chamber. A wall opens up to reveal a passageway leading to a stone chamber that takes the Player down into an another secret passageway aligned with candles and demonic icons. Coming to the end of this passageway, the Player enters an enormous cavern. Here is the Hell Hole and as well as the game's final boss: The Cyberdemon.

The Player battles the Cyberdemon and finally defeats it with the Soul Cube. The Soul Cube kills the Cyberdemon by slicing off one of its legs, then impaling its blades into its head. The Cube then flies into the Hell Hole and seals it, causing lava to boil over and solidify, bringing an end to the demonic invasion at last.

Days later, the Feet from Earth arrives. Marines and Sentry Bots enter the Delta Complex to find the entire base in ruins. They manage to locate a single survivor - the Player - who is evacuated off the planet. Counselor Swann is also found, but he has died from his wounds. The marines also search for Dr. Betruger, but he's nowhere to be found.

Unknown to anyone, Betruger is in Hell and has been transformed into a giant demonic dragon-like creature: The Maledict. The final shot of the game is the Maledict swooping down at the screen which cuts to black, and the credits roll.

Easter Egg

 * (Note: This Easter Egg can only be found using the God Mode cheat.)

When facing the Cyberdemon, enter the god mode cheat and jump into the "hellhole" in the center. Crawl all the way down until it ends. At the very end, there should be an ammo pack, a health pack, or some other beneficial item. Different things have been found, as they seem to appear at random. Another cool little tidbit is while all the way down in the very pit of the "hellhole", god mode can be turned off and the player won't get hurt, although you will die if you try to get out without the god mode on. Another interesting thing is that while battling the Cyberdemon, you can put noclip mode on, go through the left wall, and keep going. If you went far enough, you will be in the beginning of Hell and the area where the final scene takes place (before the video of the rescue) is there as well.

PDAs

 * Id Software

Characters

 * Doomguy
 * Malcolm Betruger/Maledict
 * Elliot Swann (dead)
 * Marines
 * Recon Zulu
 * Echo One (voice only)
 * Sentry Bots

Enemies

 * Cyberdemon (Boss)
 * Imps
 * Maggots
 * Maledict (cutscene only)

Weapons/Items

 * Pistols
 * Shotguns
 * Machine Guns
 * Grenades
 * Chainguns
 * Plasma Guns
 * Rocket Launchers
 * BFG-9000
 * Medkits
 * Security Armor
 * Armor Shards
 * Bullets
 * Shells
 * Clips
 * Plasma Cells
 * Ammo Belts
 * Rockets
 * BFG Cells