Emergency Systems Keycard

The emergency systems keycard is a miscellaneous item in Fallout: Brotherhood of Steel.

Gameplay
It detonates a small nuclear device.

Location
Given to the Initiate by Patty, when she's caught by Attis as a blob in the mutated Vault-Tec Corporate Vault Laboratories. It opens the final mutated section of the laboratories and starts the countdown for the vault to be destroyed by a nuclear explosion.