Sentinel Site

The Sentinel site is a location found in the Glowing Sea in Fallout 4.

Background
The Sentinel site was a pre-War military instillation that was working to make "Mark 28" air dropped nuclear bombs compatible with newer ICBM delivery systems. Later on, the facility was discovered by the Children of Atom, who were able to activate the structure's launch before being massacred by the feral ghoul inhabitants. While no missile was present to be launched, the facility still locked down all internal blast doors, requiring the Sole Survivor to shutdown the sequence to open access to full structure.

Captain Dunleavy's holotape reveals that a lot of the military personnel stationed at the site on the day the Great War occurred were nervous because communications were down and multiple launches were being detected but because of the communications being down, no one knew if it was a drill or the real thing. Sadly it was the latter.

Layout
The exterior of the Structure is a concrete pyramid, with a large blast door entrance on the North side.

As the Sole Survivor enters the facility they find themself in a rather tall room that looks somewhat like a missile silo with some catwalks going through it. In the room down the stairs to the right is a Sentinel site blast door override holotape that will open the blast doors in the facility. At the bottom of the facility there are three unused nuclear warheads in metal crates and a fourth on a forklift. They will not detonate from gunfire or explosions but nearby there will be a horde of feral ghouls hiding in a rather long tunnel. At the end of the tunnel there is a lift that will take the Sole Survivor to a second exit; not marked on the map. When the lift is called a leveled-ghoul will appear guarding a crate with minor loot.

Notable loot

 * A mini nuke, found at the end of the lower levels.
 * Astoundingly Awesome Tales, found in the first control room. Lower half of room to right of the bottom of stairs on the teal control panels.
 * Nuka grenades can be found on most "Children of Atom" corpses.
 * Three Vault-Tec lunchboxes can be found here here. One in the lower tunnels, in a hidden tiny room accessible via a hole in the left wall of a large room you pass through. Another can be found in the flooded room in the lower levels, behind the nuke on the right hand side. Immediately before ending elevator. Another under a bunk in a Barrack room on the lower levels.

Appearances
The Sentinel site only appears in Fallout 4.

Behind the scenes
The exterior design of the Sentinel site mimics that of the real world Stanley R. Mickelsen Safeguard Complex near Grand Forks, North Dakota. The facility was built as part of the Safeguard anit-ballistic missile program, itself a scaled backed version of a previous program dubbed Sentinel.