Down into the Dungeon
After cleaning up the area and staging the barracks room to look like the bugbears were just sleeping, the group moved out, back down the hallway they'd come through, to the passage that branched off now to the left.
It appears to be an irregular corridor, going 5 feet before turning right, going ten feet before turning left again, going another 5 feet before shifting 5 feet to the left and then shifting another 5 feet to the left before straightening out and disappearing into the darkness.
Listening at the beginning, you don't here any sound coming from down the hallway. But then, the twists and turns would probably dull any sound.
Listening again just before it straightens out, you do hear faint sounds that you can't readily identify. Peering around the corner just shows darkness.