I'll begin updating the OP's stats in the morning.
The group decide to continue on the path in front of them, ignoring the lake and the sound from behind them.
The path quickly leaves the room they were in just a moment ago by twisting right, headed seemingly deeper into the cave.
As the path continues the noise disappears. They must have gone too far from whatever was making it. Perhaps now they'll never know exactly what it was that led them here in the first place.
Slowly the path flattens out, no longer sloping downward, and widens. They must have reached a new room but... Is there anything here? The dim light provided by Litwick is enough to see the empty area around them, but the room must stretch well beyond their vision.
On their right, the wall is empty. But the left seems covered in what appear to be... Paintings? Markings of some sort? They must have faded with time.
A slight breeze seems to be coming from the far end of the room.