| Country | United States | 
| State or Province | Wiconsin | 
| City | Sullivan | 
| Date | 3/23/01 | 
| Time | 6pm CST | 
| Weather | Clear | 
| Duration | 10 seconds | 
| Witnesses (Number) | 1 | 
| Distance | 80,000 feet | 
| Solid Object | Yes | 
| Size | Half the Horizon | 
| Shape | Sphere, Disc | 
| Shape Details | Massive Disc Mothership | 
| Metallic/Shiny | No | 
| Color | Jet black on outside, bluish-white city in center | 
| Glow/Halo | Yes | 
| Lights | Yes | 
| How Many Lights | 2 | 
| How Bright | Very bright | 
| Light Coloration | Green, neon green, city was sky-blue | 
| Sound | No | 
| Motion/Speed | Pretty fast | 
| Number of Objects | 1 | 
| Coordination/Communication |  | 
| Windows | No | 
| Occupants | No | 
| Description | A massive, jet-black disc with green lights on the sides and a bluish-white city in the center was seen in the sky, taking up half the horizon. The witness described it as a ‘mothership’ and saw small flying objects like ants within the ‘city’. It was silent, rotated, and quickly disappeared from view. | 
| Nearby Landmarks | N5825 County Rd F, Sullivan, WI 53178 | 
| Latitude | 43.0078 | 
| Longitude | -88.5873 | 
| Altitude | Very high up | 
| Propulsion | No | 
| Advanced Capabilities | No | 
| Visible Payload | No | 
| Radar | No | 
| Signatures | No | 
| Awareness | Yes | 
| Aggression | No | 
| Health Effects | Began to take UFO and space phenomena seriously | 
| Physical/Environmental Effects | N/A | 
| Animal Disturbance | N/A | 
| Witness Feelings | Felt small and questioned the sighting, unsure if it was a galactic cruise ship or a living city | 
| Witness Assessment | Like a living city thing. The mothership had different structures and plates, jet-black with only the center lights illuminating it. It felt telepathically like ‘we are too close!’ | 
| Additional Info | UAPSRS Comment: The description the witness provides resembles Fata Morgana, the phenomenon that can cause optical illusions that can include reflections of distant objects (including cities) against the sky above. | 
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