For thousands of years, tunnels have been built to connect people to places that were previously inconvenient or unreachable. These engineering marvels provide a conduit for transporting goods and commodities efficiently. The Uranium Processing Facility Project recently achieved a historic milestone that connects Y‑12’s past to the future: the Highly Enriched Uranium Materials Facility Connector tunnel is now “in the dry,” with the last concrete placement for the roof completed.