It was always foggy in the Leased Territories, because all of the 
immunocules in the air served as nuclei for the condensation of water vapor. If 
you stared carefully into the fog and focused on a point inches in front of 
your nose, you could see it sparkling, like so many microscopic searchlights, 
as the immunocules swept space with lidar beams. Lidar was like radar except 
that it used the
smaller wavelengths that happened to be visible to the human eye. The sparkling 
of tiny lights was the evidence of microscopic dreadnoughts hunting each other 
implacably through the fog, like U-boats and destroyers in the black water 
of the North Atlantic.