The image below shows ONLY what the party can see; there are three lanterns at the moment: Klaas, Joost and Palt. The separated light source at the top is the one that shows from the tunnel.
The dwarves make their way down, followed by Ahmet and Joost, and here is the position the party reaches for the moment. The dwarves at the top of the slope (hard to distinguish now, but compare with the previous map) keep ready with their slings, for the first sign of trouble. Salth and Ganzor are in the process of rapelling down the slope from the tied off rope.
The muck is about 9 inches deep at best, and 15 inches deep at worst. It smells awful ... and while Ganzor makes one soft-spoken crack about it - that it smells like Aruth's mother's kitchen - there's very little chatter. It is like walking in heavy mud; hex-movement is halved between the slope and where the cavern rises at the top end (anywhere in the brown hexes, less evidently brown in the yellow torchlight).
The pond, which is hard to see in the gloom, begins blurping with great gusto at this point.
Something emerges ...