The Exchange was a villa surrounded by heavy walls.
Since the onset of the apocalypse, chaos had reigned. Many major traffic arteries had been blocked by pile-ups, and in an effort to contain the zombies within large cities, the authorities had even gone so far as to manually blow up numerous suspension bridges and tunnels.
This included the G215 tunnel nearest to Hope Base, which the rearguard had destroyed while struggling to hold off a zombie horde.
Chapter 100