New excavations in the western residential sector of Mohenjo-Daro have unearthed a specialized administrative building dedicated entirely to the maintenance of the city's famous sanitation infrastructure. Researchers discovered a cache of terracotta tablets that appear to be "maintenance manuals," featuring schematic drawings of brick-lined street drains and instructions for clearing sediment blockages.
The find suggests that the Indus Valley civilization employed a professional guild of municipal engineers who monitored water flow and structural integrity. These records list specific neighborhoods and the dates of their last inspections, highlighting a level of urban bureaucratic organization previously unimagined for the 3rd millennium BCE.