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6 December 2013, 11:02
After a video surfaced of a strange shape in Bristol harbour this week, the mystery has been solved.
The shape, that lights up brightly for around 20 seconds before disappearing, looks like a long piece of drift wood.
Theories on YouTube ranged from a 'bioluminescent jellyfish' to an alien.
It's now emerged it's a publicity stunt for a new illusion TV show.