No one knew what awaited them in this world, no one knew what was right or wrong anymore.
All they knew was that they had to survive by whatever means necessary, even if it meant betraying their humanity.
Sanders was looking for something, someone that was a person of interest but who that person was, was unknown. But it was a person they deemed enough of a threat to hunt down.
They discovered an underground passage and planned on sweeping the area for potential threats because this would explain why there were no zombies there.
There was no sign of life because maybe life was underground, this was what at least Colonel Sanders thought.
The place reeked but the soldiers were used to worse smells than this so they weren't fazed.
The damp floor showed that this passage had access to water as it hadn't rain as of recently.