Three interior inspections were performed in the winter by two structural engineers using rock climbing equipment to scale the interior walls. The inspectors noticed small, insignificant cracks in the walls and larger cracks in the deck stones that eventually led to the deck being replaced. The stones of the viaduct were placed in such a way as to allow interior access at just three locations. Between the longitudinal walls occasional tie stones connect the walls together. Some tie stones have large, loose stones placed on them to support work planks. The local film crew noticed rock crystal formation taking place, associated with the moist air inside and a rotting wooden platform. They also noticed some thin wood or iron pieces connecting the walls. It is unknown if these iron pieces or the platforms were used during construction or inspection. Stone stiles protrude into the airspace but do not reach the opposite side. The stiles were used to support work planks instead of traditional scaffolding due to the narrow space between the walls.