Bases

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In X-Force there are 3 different types of bases:

The "common" base
The outpost
the Alphatron mine

Base

In a base you can build all available Buildings. It can have up to 7 subterran layers and a surface layer. if you build a new base it will always consist of the surface layer and 1 subsurface layer. Protect your bases at all costs, for you will loose the game if your last base is destroyed!
For each level you dig down, the structures build there will take less damage from attacking UFOs. Buildings on the surface (including the elevator) take full damage and for each layer the damage is reduced by 50%.

Outpost

The outpost is a small and cheap version of the base, that is primary used for radarposts. Outposts don't have subsurface layers, and therefor are limited to buildings that can be build on the surface (you cannot build hangars).

Alphatron mine

in the Alphatron mine you will - of course - produce Alphatron. there are 2 factors influencing efficiency:

The ammount of the Alphatron in the region (see Tutorial: Alphatron)
The amount of workers in the mine

When building a mine, the production building is allready in place. Without workers it will only produce at ~10% efficiency. You can create quarters, recruit workers and send them to work in the mine to increase output. In a mine you may only build storages and defence buildings.

Limits:

In each country you may only build 1 base or outpost and 1 mine.