Erebus - Level 5: Erebus Research

Erebus - Level 5: Erebus Research is the fifth level of Doom 3: Resurrection of Evil. In the original version, in the second part of the level the player has to go through waste tunnels while wearing an enviro suit and picking up enviro tanks to refill their supply of air. However, in Doom 3: BFG Edition this mechanic was removed, and the player can go through the waste tunnels without a danger of running out of air. The maggots, cherubs, and mancubi return, and the player acquires the chain gun.

Summary
After fighting his way through some corridors, the marine reaches Dr. Cloud, who scans The Primitive and confirms that it's an ancient weapon of incredible power and that it serves as a gateway of sorts between our world and Hell. Dr. Cloud also gives the marine a key to the armory. The marine takes another road to the start of the level and proceeds through the armory, equipping himself with a chaingun along the way. Just after the armory, the marine finds the entrance to the waste tunnels. He equips an enviro suit a proceeds to blast his way through the tunnels, encountering many enemies along the way, including several mancubi. After emerging from the tunnels, the marine takes of the enviro suit and proceeds to the exit airlock.

Objectives

 * Armory
 * Gain access to the Armory.


 * Surface Access
 * Get the environment suit and follow the waste tunnels to the cargo station on the surface.

Characters

 * Dr. Elizabeth McNeil
 * Dr. Cloud

PDAs

 * Sean Gibson. Found in Cargo Storage Stairwell.
 * Leo Avery. Found in Armory.
 * Nathan Reynolds (X-Box version only)

Enemies
The enemy count on Nightmare is the same as on Veteran. There is no difference in monster count in BFG Edition.

Items
The only difference in the item count in BFG Edition is the removal of all enviro tank pickups (due to the removal of enviro suit mechanic from the level) and an addition of a single large med kit to the level.

There are two health stations on the level, each has 100 health in reserve.

Starting inventory
If the player starts the level via a console command, they will start with these items:

Trivia

 * This level is divided into two parts on the Xbox version of the game: Erebus: Erebus Research and Erebus: Waste Management.