Heh, we will be looking for another way in, no doubt about that. But don't confuse one of these hives with a modern city (access from every which way) or even a medieval one (access through a number of gates). There is nothing to go outside of the hive for, so there won't be any doors/gates/etc to accomodate this. I think a hive bears more resemblance to a prison than to a city. Possibly there are some kind of docking station for air/spacecraft, but how high can you jump?