I wouldn't buy a space VV nor would I buy an underground VV.

These people aren't the 21st century folks, though they might be left overs from an atomic war or something. The VV's are an island folk.

I don't think they'd have the knowledge to build underground or even in space.

It might be nice to be able to maybe have the villagers find a way to get to the other side of the island, and maybe build huts there, because their village is getting too many people. Maybe some of the kids break off from the village and find a way thru to the other side of the island, where they can start a tribe of their own. Having two tribes at once would be really challenging.

I love VV4 by the way. I like it better than the other three.