Sources
Where every fact on unexplained.im comes from.
- All-domain Anomaly Resolution Office (US Department of Defense), checked 31 Oct 2026. Used for 4 facts.
- Encyclopaedia Britannica: Bermuda Triangle, checked 31 Oct 2026. Used for 1 fact.
- Encyclopaedia Britannica: Loch Ness monster, checked 31 Oct 2026. Used for 5 facts.
- Encyclopaedia Britannica: Mary Celeste, checked 31 Oct 2026. Used for 6 facts.
- Encyclopaedia Britannica: Sasquatch, checked 31 Oct 2026. Used for 8 facts.
- Encyclopaedia Britannica: crop circle, checked 31 Oct 2026. Used for 6 facts.
- Met Office: How the Met Office monitors lightning, checked 31 Oct 2026. Used for 2 facts.
- NASA: Unidentified Anomalous Phenomena Independent Study Team report (2023), checked 31 Oct 2026. Used for 3 facts.
- NOAA Ocean Service: What is the Bermuda Triangle?, checked 31 Oct 2026. Used for 6 facts.
- Royal Meteorological Society: Ball lightning, checked 31 Oct 2026. Used for 3 facts.
- The National Archives: UFOs research guide, checked 31 Oct 2026. Used for 4 facts.
- U.S. Geological Survey: Haunted Summerville: ghostly lights or earthquake lights?, checked 31 Oct 2026. Used for 1 fact.
- U.S. Geological Survey: What are earthquake lights?, checked 31 Oct 2026. Used for 3 facts.
- Wiseman, Watt, Stevens, Greening and O’Keeffe (2003), An investigation into alleged ‘hauntings’, British Journal of Psychology 94(2) (PubMed), checked 31 Oct 2026. Used for 3 facts.
Each source was checked on the date shown. NASA and US Department of Defense, NOAA and USGS pages are US government works. The National Archives page is available under the Open Government Licence. Our drawings are our own.