 Thor goes fishing with the jötunn Hymir using an ox head for bait, and catches Jörmungandr, who then either breaks loose or, as told in the "Gylfaginning" of the "Prose Edda", the line is cut loose by Hymir.The "Prose Edda" provides the additional detail that while Thor was pulling on the line with Jörmungandr on the hook, his feet went through the bottom of the boat.The image on the Hørdum stone shows Hymir, Thor, his fishing line and a portion of the serpent.