Then the pair reached a side passageway that was unmarked!
They slopped forward, feet sloshing the muddy floor, no longer trying to avoid the water that oozed in rivulets down the narrow passageway, back toward the entrance, now out of sight behind them.
The passageway continued beyond where Martha had ventured and the Deans continued another hundred yards but once more the passageway forked.
Dean examined the ground for tracks but the water, which while shallow, in most places covered the width of the narrow passageway and obliterated any footprints.
It serves as a passageway for air to flow from the outside environment into the lower respiratory tract and lungs.