This whole outdoor area needs a lot of work, it feels totally empty. Rocks, monsters, trees? There is enough to choose from. The same goes also to the indoor areas attached to this one. The screenshots are mostly self-explanatory.

Yeah, it's been unfinished ever since inception, except for the lab area. I was hoping Phase 2-ers would spot it.

That underwater tunnel would look extra spiffing if the walls and floor were glass too, with a frame around the edges.

This seems closable -- Cap'n Toenail's done quite a bit of work on the area and I've added a tiny bit more detail myself (with one more change to come), so it's no longer an empty shell. The big outstanding issue is the glass tunnel, and I think it has its own thread already.