The Tennessee Valley Authority had years before built a hydro electric dam to serve the Knoxville area. After WW2 began FDR ordered the development of the atomic bomb. A company was formed under a local name and it was a cover for facilities to enrich the uranium for the bombs. A secret city was built. No one got in or out without clearance or escort. This city was located on the Clinch River and later after the war called Oak Ridge.
Twenty miles upstream from these facilities is Norris Dam the fist built by TVA. Had it been taken out the entire project would have been destroyed. Below the dam for nearly two miles were gun placements along a high bluff. It was feared a local plane could be stolen and loaded with enough explosives to take out the dam. A tower with a hand cart was how many got to their post to protect the dam and the tower and the cable still exist today as do the foundations for the gun mounts.
Thank you for that history lesson!! Never knew that..