Tunnels might be the most intriguing type of infrastructure out there. Urban explorers crave them, they’re hidden and shrouded in mystery, and we all have a bit of curiosity about how they’re built and work, whether that tunnel is for transportation, a sewer, or finding clean water.
Which is why the above video and the photos below are so captivating. While the video up top was filmed in July 2015, it’s new to us, and it might be new to you as well. Or else it’s worth another watch.
The 1,700-foot-long tunnel is Kentucky’s second longest, behind the mile-long Cumberland Gap Tunnel. Louisville’s tunnel burrows under a historic property on its way to the East End Bridge.
For a more updated view of what the tunnel looks like, flip through the photos above, arranged in order of construction sequence. The series brings us to December 2015. As you can see, following blasting, raw limestone walls are exposed in the tunnel. Eventually, a waterproofing membrane was installed, followed by extensive rebar work, and finally the concrete outer layer. The last image in the gallery is a rendering of the final tunnel.
While we’re at it, take a look at the tunnel entrance, what engineers are calling the portal, which is over 60 feet below grade.
For more information on construction of the tunnels, check out the video below, which uses the above photos but explains a bit more detail.