Pentagon files reveal FBI agents saw a silent black triangle hovering over a 'national security site' in June

The dark, non-reflective craft had a wingspan of roughly 9 to 15 feet and showed no visible engines or exhaust. Agents watched it rise vertically above a ridgeline, then shoot into a canyon at fighter-jet speeds — all in complete silence. The Pentagon's All-domain Anomaly Resolution Office has since produced a fuller account of the incident.

The same document release also covers reported creatures, strange lights and alleged 'portals' at a Utah ranch.

Former intelligence chief Jay Stratton says the US military used nuclear submarines as lures to monitor such objects.