Track whether the inset stays attached to the outer rim through changes in angle and light.
Crafts · image-form family
C-shaped / open-sided
Open-sided and notched forms reported in the Busan video, Baltic survey imagery and released Yukon image. This visual family connects source cases by appearance while keeping their dates, image types and interpretations distinct.
Rounded outline with an inset on one side.
Source ↗Bright open-sided form visible across adjacent frames.
Source ↗Open-sided appearance. Sky Canada later described this object as a balloon.
Source ↗Compare the geometry.
Compare consecutive frames, not only the strongest-looking still. Separate a central hole, a side opening and a protrusion.
A shared outline is a useful search feature. Test each source case with its own camera, survey and event records.
Baltic multi-angle views and the Skinwalker research example ↗
Source histories
The comparison starts with three source images: the Busan video, a Baltic sonar reproduction and the image associated with the February 2023 Yukon interception. Each shows a rounded form with an apparent inset on one side.
The research question is whether that inset is part of a physical form, a shadow or overlapping structure, or a product of imaging and reproduction. Consecutive frames and independent viewpoints can distinguish those hypotheses.
Sky Canada’s June 2025 report describes the Yukon object as a smaller balloon. The Korean sequence and Baltic feature retain their own source histories.
More reports linked in the discussion
The thread adds five useful leads. These descriptions help narrow the search; the three main image cases stay separate.
| Report | What the source adds |
|---|---|
| Mount Vernon, Missouri ↗ 20 February 2024 | One observer, using 12× binoculars for 3–4 seconds, described an irregular round object: either a missing piece or a protrusion. The report predates the Yukon comparison thread. |
| Newton Abbot, England ↗ Claimed 4 November 2016; article 14 September 2022 | John Mooner describes a greenish horseshoe photographed with a Nikon P900. |
| Saint Petersburg, Russia ↗ Claimed 14 September 2020; upload 17 September | Sampled views show a small object changing apparent profile against the sky. Its edge is too small in the inspected video to resolve a C-shaped opening. |
| Pernambuco, Brazil ↗ Claimed 11 July 2020; upload 12 July | A sampled later view shows a dark double arc above several lights, rather than the isolated bright C seen in the Busan image. |
| North Phoenix, Arizona ↗ Sighting date unresolved | A commenter links an older description of a doughnut-like object with a bite-shaped opening. The phrase appears in both posts. |
Sources and image credits
- UFO over Busan, South Korea — original upload ↗ — xxxdonutzxxx / WorldPix, 2012-07-27
- Busan clip — circulating 2024 repost ↗ — John Greenewald / The Black Vault, 2024-09-25
- Ocean X discovery announcement ↗ — Ocean Explorer / Dennis Åsberg, 2011-08-15
- Baltic sonar image reproduction ↗ — Live Science, 2012-06-18
- Image released of object shot down over Yukon in 2023 ↗ — CTV News; DND image via access to information, 2024-09-24
- Sky Canada report — subsequent Yukon characterization ↗ — Office of the Chief Science Advisor of Canada, 2025-06
- UFOB comparison discussion and linked reports ↗ — Reddit / r/UFOB, 2024
- NUFORC report 180548 ↗ — National UFO Reporting Center, 2024-03-13
Source imagery retains its original rights. Individual media records identify the publisher and reproduction.