Thor seized his hammer, preparing to smite the creature's head; but even as he swung Miölnir high for the fatal blow, Hymir cut the fish-line with his knife, and down into the depths of ocean sank the Midgard serpent amid a whirlpool of eddies. But the hammer had sped from Thor's iron fingers. It crushed the serpent's head as he sank downward to his lair on the sandy bottom; it crushed, but did not kill him, thanks to the giant's treachery. Terrible was the disturbance it caused beneath the waves. It burst the rocks and made the caverns of the ocean shiver into bits. It wrecked the coral groves and tore loose the draperies of sea-weed. The fishes scurried about in every direction, and the sea-monsters wildly sought new places to hide themselves when they found their homes destroyed. The sea itself was stirred to its lowest depths, and the waves ran trembling into one another's arms. The earth, too, shrank and shivered. Hymir, cowering low in the boat, was glad of one thing, which was that the terrible Midgard serpent had vanished out of sight. And that was the last that was ever seen of him, though he still lived, wounded and sore from the shock of Thor's hammer. Now it was time to return home. Silently and sulkily the giant swam back to land; Thor, bearing the boat upon his shoulders, filled with water and weighted as it was with the great whales which Hymir had caught, waded ashore, and brought his burden to the giant's hall. Here Hymir met him crossly enough, for he was ashamed of the whole morning's work, in which Thor had appeared so much more of a hero than he. Indeed, he was tired of even pretending hospitality towards this unwelcome guest, and was resolved to be rid of him; but first he would put Thor to shame. "You are a strong fellow," he said, "good at the oar and at the fishing; most wondrously good at the hammer, by which I know that you are Thor. But there is one thing which you cannot do, I warrant,--you cannot break this little cup of mine, hard though you may try." "That I shall see for myself," answered Thor; and he took the cup in his hand. Now this was a magic cup, and there was but one way of breaking it, but one thing hard enough to shatter its mightiness. Thor threw it with all his force against a stone of the flooring; but instead of breaking the cup, the stone itself was cracked into splinters. Then Thor grew angry, for the giant and all his servants were laughing as if this were the greatest joke ever played.