With the above in mind, how about letting India join the Golden Fleece/"Colony" race VC? Obviously, they'd be more focused on getting the Colony founded (it will probably be near impossible for them to get to the GF in time for the scenario's end!)
Here's the update on the underworld. It's made of LM Mountains (impassable), Volcanoes (only passable by a select few units, look a lot like the mountains), and Marshy "underworld" terrain (technically passable by all, but of course only the units who can navigate through the volcanoes will be able to get to it). Originally, it was a maze, but since I've opened up two "large" rooms, which will contain some "roaming" monsters. If really needed, I can also extend the underworld as far as the Western edge of the map. Here's the SS:
Also, I've been thinking of making an equivalent in the Indian ocean, for the more "Eastern" civs to get to, like India, Ethiopia, Egypt, etc., basically because the chances of them getting anywhere in the European underworld is next to nil. Anyone have any ideas of what it'll could look like, what could go there, etc? I really want to go to town on these underworlds, make them a fun novelty to play with!
EDIT: Well, I've been having fun today, by extending the underworld to the edge. After a long journey (probably well after the game has ended), you'll be able to reach either the Elysian Fields, or Tartarus.
Both have their advantages and disadvantages, and both routes require you get through a large chunk of volcano. In the Elysian fields, you can capture Settlers, and can generally build a great place. There will also be a wealth of heroes here, and almost no enemies, so it's the "easy" route. Tartarus, on the other hand will eventually give you the ability to capture and use Titans! These will be the most powerful units in the game! However, perils await - Tartarus is pretty much a labyrinth of volcanoes, all ready to go off at any moment! Furthermore, Tartarus is chock-full of enemies - and they can traverse volcanoes, which allows them to strike
anywhere, even the Elysian fields and outside the underworld! So, another of the Tartarus' routes advantages will be that you can attempt to try to make the entire world a safer place!
To do this, I've had to axe most of the British Isles, although a tiny corner (pretty much just Cornwall) is still present, as from what I've read, Cornwall with its tin was a pretty important place as far as ancient trading was concerned.
Anyway, here's a screenshot. As you can see, it's going to be hard navigating where the routes actually are in Tartarus!: