So it is a pool or a lake, and not an underground river,” he thought. Still he did not dare to wade out into the darkness. He could not swim; and he thought, too, of nasty slimy things, with big bulging blind eyes, wriggling in the water. There are strange things living in the pools and lakes in the hearts of mountains: fish whose fathers swam in, goodness only knows how many years ago, and never swam out again, while their eyes grew bigger and bigger and bigger from trying to see in the blackness; also there are other things more slimy than fish. Even in the tunnels and caves the goblins have made for themselves there are other things living unbeknown to them that have sneaked in from outside to lie up in the dark. Some of these caves, too, go back in their beginnings to ages before the goblins, who only widened them and joined them up with passages, and the original owners are still there in odd corners, slinking and nosing about. Deep down here by the dark water lived old Gollum