Very strange prints on small island in Norway

The story of the "UFO Ring" on Espevaer.
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Links:
uforingen.com (in norwegian)
00:00 The North Sea 1975
00:21 M/T Norskjell
02:05 The discovery
02:26 The Ring
03:12 Media attention and Armed Forces
04:05 The theories
05:02 Fairy Ring Debunk
06:06 A new imprint!
06:45 A tourist attraction
07:33 Questions…