Reinforced concrete and hard edges make up the bulk of the chapter's architecture. It's bleak and run-down, and looks as if it has just been awoken from a long period of disuse. Tight corridors and sharp turns paired with the distant rumblings of the Gargantua create a claustrophobic air. A high density of enemies in tight spaces creates fast-paced, desperate action.
In Power Up, the Gargantua is introduced to the player. Initially exposed to the monster for only a brief moment before he reaches the cover of the abandoned rail network's generator facility. Along the chapter's path he encounters more HECU Marines, Vortigaunts and Houndeyes. The player's main objective is to restore power to the area in order to kill the Gargantua (which happens only between two massive, arcing coils, electrocuting the giant beast), as well as providing access to the tram which is required to proceed to the next chapter.
