I've decided what Cerato's cave looks like :O

See the rocks on the other side of the pool? That's pretty much his respiteblock, and the pool is for fun, swimming and stuff. And the light comes from luminous rocks.

This is an entrance to his cave, not the one Itero's hive is near though

That's one of the places the water in the caves comes from, a nice place to leave if he's willing to get wet.

Another cavern. On the left in that little area of sand/rock is where the canyon from Itero's house leads.
[original]

Pretty much the main entrance. The view in the picture would be coming from the first picture if you were to walk out of it to the right. The caves going into the ground behind the little pool would be going to the canyon entrance. And finally to the left, that small tunnel, goes to the water entrance that's nearly impossible to get out of.

So yeah, mini tour of Cerato's cave-hive!