If Vikings were here today, the sounding of a distinctive horn in York would have created chaos.
The ancient instrument, blown last night, signalled exactly 100 days until the end of the world, according to Norse mythology.
Legend has it that the Norse God, Heimdallr, would blow the mythical Gjallerhorn to warn of the Viking apocalypse, also known as 'Ragnarok'.
Ragnarok, which translates to Doom of the Gods, is due to be preceded by the winter of winters.
Vikings believed, prior to the apocalypse, three freezing winters would follow each other with no summers in between.