Gate room
From The Stargate Omnipedia
The heart of Stargate Command, the Gate room is a modified missile silo where the Stargate is housed. Also known as the Embarkation Room, it is located on sublevel 28 deep inside Cheyenne Mountain.
KEY EPISODES
Children of the Gods - Apophis dials Earth and invades the Gate Room with a squadron of Jaffa, taking one U.S. soldier captive.
Message In a Bottle - The Gate Room is compromised by an alien "orb" that plants itself in the cement of the chamber.
Foothold - A group of alien invaders self-destruct in the Gate Room after their escape is prevented, doing a significant amount of damage.