Unidentified submerged object
- "Mysterious craft off coast of Sweden sparks hunt for USO (Unidentified Submerged Object)". 21 October 2014.
- "Archived copy". Archived from the original on 2014-12-28. Retrieved 2014-12-28.CS1 maint: archived copy as title (link)
- Speigel, Lee (31 May 2012). "Baltic Sea UFO Hunters Look To Identify Mystery Object" – via Huff Post.
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