"Scan the area for hidden tunnels and fake walls. The design of the tunnels says that there should be more down here, and I want to be absolutely sure before we move back to rejoin the group." Huntress Khan instructed.
The lingering effects of the battle, combined with whatever the enemy had been doing in here that managed to bring the demonic beings in from the other layer, had left a load of chaotic energy signals that were interfering with the sensors.
So, they did it the old-fashioned way and thumped their weapons against everything, stomped their feet and finally used the flamers on the walls to see if anywhere cooled at an unusual rate.
"There's nothing. Could it be that they just built an exit in an old tunnel used for summoning because it was convenient? We might be attributing too much forethought to the construction of the trenches.
They might have just built them there because that's where the offensive stalled." Max suggested.