A curated record of declassified, decommissioned, and verified legacy underground facilities — sourced exclusively from public records, government releases, and credible reporting.
Project Greek Island
1958–1992
Continuity of Government — Congressional relocation facility
Decommissioned — open as public museum
This entry anchors the archive because it is the most thoroughly documented example of a confirmed COG facility in the public record. The exposure by journalist Ted Gup in The Washington Post on May 31, 1992 provided unprecedented documentation of this previously secret government program.
112,000 sq ft
720 ft below surface
25-ton blast doors
37.7849° N, 80.3098° W
$14 million (1958 dollars)
Estimated cost to taxpayers
The Washington Post, Ted Gup
May 31, 1992
Editorial methodology for evaluating facility records
Verified by official government documentation or declassified records.
Supported by multiple credible independent sources but lacks official confirmation.
Single credible source, not yet corroborated.
Contradicted by credible counter-evidence.
Demonstrably false — evidence actively contradicts the claim.
Browse and filter documented underground facilities
9 facilities displayed
Territory disputed — administered by Russia since 2014, claimed by Ukraine
This entry is an educational record of how unverified claims spread. The tunnels are real and documented. The secret base claims are not supported by credible evidence.
Key moments in the declassification of underground facilities
Church Committee hearings expose COG programs
Washington Post exposes Project Greek Island / The Greenbrier
Kelvedon Hatch opens as public museum
UK government acknowledges Burlington (Site 3)
Diefenbunker designated national historic site
FOIA releases confirm Mount Weather operations
All entries are sourced from public records, declassified government documents, and credible journalism.
No classified information is accepted or published on this site.
To request a correction or redaction, contact us via the Contact page.