Explosives factory in Sweden receives scary nighttime visit - 1976

A mysterious incident in the winter of 1976 which despite the existence of physical traces remains a mystery to this day.
Links:
archive.org/details/UFO_Infor...
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00:00 Lake Vikern
00:58 January 21, 1976
02:10 The Encounter
04:42 The Discovery
05:58 The Ring on the Lake
07:03 Allan's Credibility
08:39 Involuntary witness