The camping ground, looking west; the river is behind the observer and the radio tower visible to the right in the background
This small fallout shelter was constructed on the shores of the Crane River to serve the Greenbriar family. Unfortunately, the mirelurks that emerged from the horribly polluted river - a soup of mutagens even before the war - has prevented them from leaving its confines, dooming Mr and Mrs Greenbriar to death of starvation.
The entrance to the bunker is located almost directly east of radio tower 3SM-U81, in the bushes next to the small camping ground on the western shore of the river. The interior consists of a small sheltered area with empty shelves and the remains of the Greebriars, together with empty tin cans, and a ruined toilet in the back. The ham radio is the source of the Greenbriar radio signal and can be switched off.
Greenbriar bunker appears only in Fallout 4.