We see: Jackson picking his way gingerly through a cramped, claustrophobic fissure, and stopping to pick up something distinctly unsavoury off the ground with a gasp of bemused revulsion.
We hear: "The goblin tunnels below the Misty Mountains. We've made sure that all the different walls can be removed so that we can shoot the angles that we need.
Oh my god, look at this thing here! It looks like a foot! Or an arm. Ugh, I don't know."
We learn: It's a good thing Jackson went into movies rather than surgery. Also, that this was the first location used for shooting - the iconic setting for Bilbo's fateful encounter in the dank gloom of the mountain's belly.