S-4

S-4 or Site Four is a facility first described by whistleblower Robert Lazar during a 1989 interview with KLAS television. Lazar described a remote location on the outskirts of the notorious Groom lake complex (Area 51) that consisted of 9 camoflaged hangar doors set into the hillside. The up-coming documentary Project Gravitaur will feature S-4, including a VR experience that will enable viewers to view the facility in the first-person perspective.

Location of S-4

S-4 is located off the eastern shore of Papoose dry lake, approximately 13 miles south of Area 51 (Groom dry lake). There is a teardrop feature on the dry lakebed, S-4 is about 900 feet off the lakebed, where the desert floor meets the hillside.

Drawing of S-4

Description of the base

Location of S-4 - Off the shore of Papoose lake, NV

S-4 consists of a facility built into the hillside, it has multiple hangar bays, work areas, laboratories, meeting spaces and areas for the staff. As they pulled up to the facility, the bus would drive past the row of nine camoflaged hangar doors before turning 90 degrees to the left and pulling up to the pedestrian entrance. The doors sat at a 30-60 degree angle, were sand colored and coated to match the texture of the surrounding desert environment. A synthetic tarmac area was present outside the hangar doors.

Several of the camoflaged hangar doors appear visible in this overhead shot

Once Lazar was dropped off at the pedestrian entrance, he would go inside a double door type entry and by pass the front security desk to reach a hand scanner. Once the scanner verified his identity, a card authorizing access to locations within S-4 he was cleared for would be dispensed.

People alleged to have worked in S-4

• Bob Lazar
• Dan Burisch