Wow, i really love the ideas behind this map, it's absolutely great. I haven't seen any bugs, but i've got a few suggestions.
You've got to tone down the survival, they know where you are instantly and you can't find them for awhile. Anyway to fix that? Plus, on easy AI my game got wtf pwned, should tone it down some? (Or i don't event wanna try any harder...)
Zepplins need some sort of penalty when it's shot down for the units, when i fall down that far i expect some sort of damage to myself.
Cave ins possibly? I never got to see what earthquake does, but disregard this message if earthquakes would do the same thing.
A drilling veichle would be really cool, it'd make traveling underground much easier.
You really need to expand the missile types just look up a page of it and check out the models wikkis a decent source:
List of missiles - Wikipedia, the free encyclopedia
Also, expanding from just rocks would be cool, theres more then "rocks" under there ya know? Such as volcanoes, underground lakes (wells), other types of rocks, and gems. It'd give the game a cooler aspect
Nuclear war and no mutants and stuff?
Not even like mutant moles n' stuff like that?
Great job so far on the map, keep up the work 4 out of 5