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This small abandoned shack, inconspicuously located off the beaten path, holds a secret surveillance facility.
The unassuming shack has a stack of radioactive barrels in front of it (which peak at 30 rads per second), as well as an armor workbench on the porch. The interior is seemingly bare, containing only a bed and a table as well as a trapdoor that leads down to installation K-21B.
- The map marker's name changes to "Installation K-21B" following the exploration of the surveillance installation.
The abandoned shack appears only in Fallout 4.
- Fallout 4 Vault Dweller's Survival Guide Collector's Edition p.360: "[5.18] ABANDONED SHACK
Warning! Extreme radiation danger! An unassuming shack has a federal survival installation (codenamed K-21B) hidden beneath it. Enter the shack and open the trapdoor (Novice) or use the key in Bill the skeleton’s suitcase."
(Fallout 4 Vault Dweller's Survival Guide Map)