You come out back over the water.
The cavern has a roof, but somehow it's lit as if there's dim sunlight filling the air. You think the water itself is shining somehow, but can't quite tell.
The cavern is large. A quick buzz around reveals three areas of interest.
There's an island of sorts near the center. Part of the island is covered in large, odd looking, purple flowers. A stone hut sits next to this bizarre garden.
The water must get shallow to the east, as you can see the bones of several animals sitting in the water. Most seem to be the skeletons of moose or maybe horses. You see a couple of human looking skeletons mixed in.
But the weirdest part may be what you spy along the southern wall. There's a row of pipes jutting up out of the cavern floor. They look like spouts, though nothing is running out of them. They are just...sitting there.