This is the interior of the factory, seen at the start and at the climax of the film. Very similar to the design rationale at the exterior, the under city. Due to it being in a tree's interior, it was cylindrical, which can be quite restrictive but we used it to our advantage to create a daunting and intimidating atmosphere that really utilised the vertical height.
The design of this area was done by my groupmate, Fu Meijo, before passing it over to me to model and texture.