"Then that too shall happen, that Naglfar shall be loosened, the ship which is so named. It is made of dead men's nails; wherefore a warning is desirable, that if a man die with unshorn nails, that man adds much material to the ship Naglfar, which gods and men were fain to have finished late. Yet in this sea-flood Naglfar shall float. Hrymr is the name of the giant who steers Naglfar." Gylfaginning, 51.