Billboard posted in Oak Ridge, Tennessee, on December 31, 1943. Oak Ridge was a secret town that housed workers and their families for the Manhattan Project. The town was entirely fenced in, with armed guards posted at all entries (The Atlantic)
There’s a water drainage tunnel at the far end of the soccer field at Blankenship. In that tunnel, you go down about 60 yards of 20 degree decline where you meet a small man-made waterfall. The tunnel is about 3 and a half feet in diameter, and crouching is necessary. Some rooms open up to standing space. You’ll see graffiti from all the way back to the late fifties (all ORHS themed). There will be a couple streams to pass, and then you realize you’re under Jackson Square. This was strange, since you can hear the goings-on. When we were there, it was after a play. We could hear people pouring out of the theater and chatting. Continue on a flatter tunnel passage, and you will encounter a couple standing spaces as you go under the Appalachian Underwriters building (skyscraper of Oak Ridge). You will have to climb through wood structural support beams and shimmy across a ladder to get through to the exit of the tunnel, at Eddie Hair Tire.
A couple thoughts:
-I did this before Eddie Hair Tire was remodeled. Check for a tunnel exit at the new space before attempting this.
-BRING FRIENDS AND FLASHLIGHTS. And water.
-Never do the tunnel after a rainstorm, because a stream will run through the bottom of the tunnel, making you cling to the sides. Try for a dry day.
-Most of the trip is downhill, so if you encounter a problem, you have an uphill return. For safety’s sake, turn around and go up instead of continuing on, because you never know if there will be an obstruction.
-Be wary of weird stuff that could be down there.
From a thread on Topix titled “Tunnels Under Oak Ridge”