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 called the "Embarkation room" in the Stargate program's early years, 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.