Riddle of the Sphincter!

Through a combination of spells, magic items and cooperation, the Party manage to get up through the disgusting, dripping, sphincter-like opening. The ‘room’ above seems to be the processing chamber to the dumping ground below and the buzzing, magical screen, simply there to keep the bulbous flies, down below.

There are wheelbarrows full of organic waste materials and four naked dwarves are laid out on stone slabs beside the walls, but they are quite dead. All four of them have had their stomachs cleanly cut open and then roughly sutured back shut.

On a nearby metal table, sits a large, pad-locked, iron strongbox.

It’s far too big to stuff into Issack but the half-elven thief; Nitendae makes short work of the heavy lock.
Inside are around thirty opals and jasper gems. They are obviously valuable but all of them seem to be covered in some slimy, pink goo…
Dead dwarf guts!

Treasure: 

Jaspers x 15: Average value: 50gp each.

Opals x 11: Average value: 1000gp each!

(Excluding  3 Jaspers used for bribes.)