Frequently Asked Questions

The Deep Underground Military Bases (D.U.M.B.) Database is a public-interest research platform documenting publicly available information about underground military and government facilities worldwide. Our database includes verified facility locations, construction details, purposes, and costs gathered from government documents, FOIA releases, and credible sources.

We employ a rigorous verification process that includes cross-referencing multiple sources, FOIA document analysis, satellite imagery verification, and expert review. Each facility entry is marked with a confidence level to help you understand how well-supported the information is.

• Confirmed Official government documentation or declassified records
• Corroborated Multiple independent credible sources, no official confirmation
• Unverified Single source, not yet corroborated
• Disputed Contradicted by credible counter-evidence
• Debunked Demonstrably false

Yes. We welcome community contributions. You can submit facility information through our Contribute section. All submissions undergo our verification process before being added. Please provide as much detail and supporting evidence as possible.

Yes. Our database contains only publicly available, unclassified information obtained through legal means such as FOIA requests, government reports, and open-source research. We do not publish classified or sensitive security information.

The database is freely accessible through our search interface. You can filter by country, facility type, and confidence level. No registration required for basic access.

We welcome research collaborations and media inquiries. Please contact us through our Contact page to discuss opportunities.

We will never publish:

• Classified information
• Active security details
• Facility access instructions
• Trespassing guidance
• Operational personnel information

See our Research Methodology page for the full list.