The Kraken: What is it and why has Trump's ex-lawyer released it?

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The Kraken is a gigantic sea monster from Scandinavian folklore that rises up from the ocean to devour its enemies.

It's also become an internet meme representing a sprawling, unsubstantiated set of claims that purport to outline the case for widespread fraud in the US presidential election.

Pro-Trump groups including QAnon conspiracy theorists have amplified the idea under the hashtag #ReleaseTheKraken, and it's being widely shared by those supporting the legal campaign to challenge the election results.