Vault door (Fallout Shelter)

The Vault door is a room in Fallout Shelter.

Overview
The Vault door connects your Vault to the Wasteland. The door is a fixed entry point to the Vault and cannot be constructed or demolished. It is the only room that is unavailable in the construction menu. The Vault door can hold up to two Dwellers as an initial defense against raiders, feral ghouls or deathclaws. Different enemies take varying amounts of time to break in: stronger enemies like deathclaws will break in faster than weaker enemies like raiders. It can be upgraded two times to increase the time it takes attackers to break into the Vault. Dwellers assigned to the Vault door will only gain experience during raids and will not level up as those assigned to normal production rooms would.

Cost

 * Upgrade 1: 500 caps
 * Upgrade 2: 2000 caps