Cameraman Hjörtur Kjerúlf captured this video of the Lagarfljótsormurinn (or Lagarfljóts Worm) wending its way through its home in Lake Lagarfljót.

This creature has been sighted on and off since 1345 and possesses an origin straight out of one of Hellboy's less exciting adventures. Explains The Iceland Review:

According to legend, it was at first a tiny worm which was placed on a ring of gold to make the gold grow. When the owner of the ring returned she noticed to her great terror that the worm had grown immensely but not the gold. She tossed the ring and worm into Lagarfljót where the worm continued to grow.

Honestly, this video of the Lagarfljótsormurinn resembles a floating piece of translucent tarp, but I have no choice but to fear a creature that boasts so many consonants.

[Ruv.Is via The Fortean Times]