In 1977 the Japanese ship Zuiyo-maru caught a highly decomposed carcass first assumed to be that of a plesiosaur. Though quickly identified as a basking shark, a recently uncovered image from the small New Zealand fishing vessel Karetai dating to 1975 casts doubt on this theory.
By the 1950's it was widely accepted that the giant squid (Architeuthis dux) was the origin behind the myth of the "Kraken".
In 1956 this theory was challenged with the discovery of an enormous shelled carcass found beached upon the small Norwegian island of Flesa.
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