Joyful celebrations ring out in the cold night air Grendel the monster is dead and ... murky green water Fearlessly swam till he came to a cave. Who killed my son? Who killed my son?

A search party tracks Grendel's mother to a lake where she lives in an underwater cave. Hrothgar gives Beowulf a sword which, he tells him, has magical powers. Then Beowulf dives into the lake.