Free Ghoul prisoner

Free Ghoul prisoner is a side quest in Fallout.

Walkthrough
In the Watershed building of the Watershed area of Necropolis, the Vault Dweller will find some prison cells just down from the Water pump. A ghoul is trapped in one of them.

The Vault Dweller can unlock the cell and ask the inhabitant about where the water chip would be kept. Conveniently, the entrance to the Vault where it resides is right next to the ghoul's cell. Experience is granted as soon as the ghoul leaves his cell.

Rewards

 * 500 XP
 * Location of water chip - Vault 12