Urban explorer Warren Tepper and his friend Matt Nadin are on borrowed time traipsing through an underground tunnel. They know a security van circles somewhere overhead, but they still keep pushing on deeper. And it’s a good thing that the pair carry on with their quest, too, as what they are about to uncover will not only astonish them, but also the world at large.
The site that Tepper and Nadin chose to explore has a very lengthy and potentially dark history, in fact. You see, the tunnels appear to have played a part in World War II. And their location points to who may once have used them, as they snake beneath Duisburg, Germany – a city that at one point was held by the Nazis until the Allied forces took over the area.