Series 1000 shelter

The Series 1000 shelter was an underground facility designed by the Vault-Tec Corporation.

Background
Its description was first seen on a blueprint, which is used as the town map for Vault 15. It appears to have been a "one-level subterranean mini vault," intended to be affordable for small corporations and medium-sized communities.

Appearances
The Series 1000 shelter is mentioned in Fallout 2 and Fallout: The Roleplaying Game.