From version translated by Burton Raffel. Answer shoud come between sections 1-3.
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Grendel's lair is described as bring "down in the darkness".
. . A powerful monster, living down
In the darkness
Beowulf/ Burton Raffel
Grendel's lair is a pocket of air within an underwater cave; he lives (lived) with his mother. The entrance to the cave is in the depths of a lake filled with numerous sea-monsters. In fact, it seems as though the lake is supernatural: the lake is described such that its surface is afire and that a deer being hunted by wolves would rather die by the wolves than jump into that lake.