Alpha Labs - Sector 1: Union Aerospace Science Division

Alpha Labs - Sector 1: Union Aerospace Science Division is the fifth level of Doom 3. Built in 2095 and located on Site 2, Alpha is the UAC's center research lab. Sector 1 houses the EPD (Elemental Phase Deconstructor) and the Hydrocon. Maggots are introduced midway through the level in a cutscene.

Summary
Sergeant Kelly radios in again, urging the Player to meet up with Bravo Team as soon as possible. The Player enters Alpha Labs's Reception area and clears out the zombies inside. He then uses a security terminal to open a locked door and proceeds deeper into the facility. He fights his way to the EPD Lab, where he finds that the only way to go further is through the EPD collection chamber. After clearing out the demons and zombies in the EPD control room, he opens a repair gate, giving him access to the collection chamber. The Player crawls into the collection chamber (being sure to avoid the instantly fatal EPD beam) and exits through a maintenance conduit.

The Player heads further through Alpha Labs, until he runs into a fire blocking the way. He finds a monitoring station at the EPD Particle Emulsifier and uses it to extinguish the fire. Upon reaching the EPD Contaminant Purge room, he encounters a new enemy - Maggots. After defeating the Maggots, the Player crawls through a crawl way underneath the floor and arrives near the section responsible for maintaining the Hydrocon. Eventually, he encounters a survivor - George Krietman - who warns him not to shoot the Hydrocon tanks inside the lab. The Player proceeds further into the base, where he uses the PDA of the deceased Bernie Lipsitz to gain access to the Hydrocon itself. Here, he catches a glimpse of Counselor Swann and Jack Campbell heading through Hydrocon Observations. The Player finally reaches the exit elevator, where he defeats another ambush by Maggots, before taking the elevator to the next level.

PDAs

 * Kyle Berger: At EPD Lab.
 * Jack Smith: At EPD Particle Emulsifier.
 * Bernie Lipsitz: At Hydrocon Stabiliazation
 * George Krietman

Video disks

 * Elemental phase deconstructor: In EPD Lab, in the control room.
 * Hydrocon: In Hydrocon Control.

Characters

 * Sergeant Kelly
 * UAC announcer
 * George Krietman
 * Elliot Swann
 * Jack Campbell

Enemies
Note: includes only enemies that can be fought and killed.

Weapons/Items
There are also 3 health station on the level: one with 100 health in reserve, one with 73 health, and another one with 44 health.

Cabinets

 * Storage Cabinet #009: 752. Found in EPD Lab, code learned from Kyle Berger's audio log. Contains: security armor, med kits (large) x2, grenades, clip (large).

Trivia

 * In Hydrocon Junction 1 where the player is attacked by two imps, there's a small semi-hidden control panel on the side of one of the columns which can be used to open the armory in that room.
 * The door from EPD Particle Scrubber to EPD Contaminant Purge can be jammed open if a Z-Sec is killed and drops the machinegun in the doorway. After the Maggot introduction cutscene, retreat is still possible through the open door. If the player collects the dropped weapons (by firing a machinegun and reloading) that jammed the door open, the door will close and lock until the necessary maggots are killed.  If they're on the other side of the door, game progress is deadlocked without the use of cheats or reloading a prior save.
 * In the last room where the player is attacked by multiple maggots, the door normally locks behind the player upon entering the room, and unlocks after the player kills all the maggots, but sometimes the script to unlock the door doesn't work and the door remains closed, preventing the player from going back to replenish ammo/health.