The end of the world is almost upon us if Norse mythology is to be believed, which predicts the Earth will split open and release the inhabitants of the underworld on 22 February. On Saturday, according to Norse legend at least, the series of events leading up to Ragnarok will culminate in an epic battle, where Norse gods Thor, Loki, Odin, Freyr, Hermóðr, will fight. Odin will be killed by Fenrir and the other creator gods will fall. The Earth will fall into the sea, and life as we know it will cease to be. It's not all bad news though, as the world will re-emerge anew and fertile, and two human survivors will be in charge of repopulating the Earth. Ragnarok is described in the 13th century Prose Edda, written by Snorri Sturluson. The Vikings believe Ragnarok occurs after three freezing winters, with no summers in between.