Mining is dead, but it can be revived!

[Frank_Stein]

Nah, I mean the generation of the terrain. Progression through the dungeon would be on a floor by floor basis. So you enter from the station, then go to another z-level where a dungeon floor has been prepared. In that floor is a staircase that goes deeper in, to a second floor in the same z-level that's generated while you're in the first, and upon entering that, the first area is regenerated into a third floor, and so on and so forth creating an infinite dungeon.

And occasionally an extra exit is made that takes you instantly back to the station, but requires restarting from the beginning.