Vault 101 Atrium

The Vault 101 Atrium is located on the Upper Level/Atrium of Vault 101. It is a two-story room oriented east-west with balconies connected by walkways overlooking the lower floor. The Main Entrance to the outside world is joined to the east side of the Atrium by a series of connecting hallways and stairways. Atrium's large size is ideal for sports-related events, such as baseball.

There are many rooms which connect to the Atrium. On the lower level, on the northern side, there are two supply rooms. To the west, there is a cafeteria. A third room, located in the south-west, is accessible to the Lone Wanderer. This room is a workshop/supply room. On the floor above, on the northern and eastern sides, there were the utility and equipment rooms. The southern balcony, which passes a window of the Mack Family's apartment, leads to the Systems Room. Between this balcony and the northern balcony, on the western wall, there is the circular window of the Overseer's Office.

In 2268, according to a posting on a bulletin board in the Diner, a game is planned for an upcoming Saturday if a resident volunteers for the position of shortstop.

Later, nine years later, the Lone Wanderer chances upon Tom Holden and Mary Holden as he/she is escaping from the Vault. Mary is attempting to discourage Tom from escaping. Ignoring her advice out of desperation for freedom, Tom is killed by members of the Vault Security as he runs for the Main Entrance. Mary, seeing her husband killed, runs to her husband when she is killed herself.