TVA explores a creepy abandoned tunnel at the historic Norris lab TVA has no idea what the original purpose of the dark & creepy tunnel was, but officials intend to find out. Author: WBIR Staff Updated: 1:12 PM EST March 8, 2021 NORRIS, Tenn. — Now is not the time to go exploring in creepy, dark tunnels! The Tennessee Valley Authority knows that, so when a previously hidden tunnel was discovered during excavation work at the Norris Lab, officials were smart enough to send in a drone, not a person! The entrance to the buried tunnel was found during routine renovation work at the lab. It's forty feet long and ten feet wide, and every inch of it is crawling with spider webs, mice and who knows what else!?