Old Olney underground

 is a place added to Fallout 3 with the add-on Broken Steel, accessed via a ladder in Old Olney Sewer.

As part of the quest Shock Value the Lone Wanderer passes this area to reach the Olney Powerworks. It is inhabited by ghouls Kidd and Wint and a lot of Deathclaws. The ghouls (along with several more now-deceased friends) tried to establish a colony here, but disturbed a Deathclaw nest. Kidd and Wint were the only survivors.

Sections
The area can be divided in four small subsections:
 * The first is the home of Kidd, Wint and their ghoul compatriots.
 * The second area appears to have been a children's hospital.
 * The third area is a utility section under the hospital, which contains quite a few Custom-built weapon components, such as two Cherry Bombs, a Lunchbox and plenty of Turpentine, Abraxo Cleaner, and other components along with two workbenches.
 * The fourth area is a short tunnel and another utility section leading to Old Olney S. Wilson Building.

Skeletons, fortifications, and weapons caches throughout the hospital and basements suggest the area had seen a large battle long before the Ghouls tried to establish a colony there. Relatively recent tunneling suggests one faction may have tried to burrow their way into their enemy. The identities of the combatants, the era in which the conflict took place, and the origin of the Deathclaw hive remains a mystery. But a possible explanation may be rioting in or around the hospital as a result of the rapid deterioration of humanitarian conditions after the Great War. A similar incident occurred at Germantown Police HQ.

Notable loot

 * A Mini Nuke is found underneath a Teddy Bear next to a bookshelf full of children's toys. The room is located behind the Lone Wanderer after he/she meets the first Deathclaw on the ramp. When at the top of the ramp, turn around to see a small gap in the wall to the right. After entering the room you will notice the broken door so the gap in the wall is the only way to access the Mini Nuke. (Also, between the two upright filing cabinets, there is a shelf on the wall with a box on it. In the box is some Flamer fuel and beside it are two Microfusion Cells and a Frag Grenade.)
 * Underneath the hospital area, and into the utility area (beyond the rubble), be prepared to meet several Deathclaws. There is a locked cell door behind a chain link fence with a tool shed next to it west of the first counter with a workbench on it. Opening the door reveals a set of stairs down to a single room. Behind the makeshift barricade is a Nuka-Cola Quantum behind a Ham Radio.

Appearances
appears only in the Fallout 3 add-on Broken Steel.