OOOOOh!
That tunnel looks like the entrance to the underworld.
I can imagine the Grim Reaper emerging from the darkness; bony fingers beckoning me to my final journey.
Flash shiver and neck/arm hair standing at attention now!
Spooky. Really spooky, dude! Lol!
Namaste, JaiChai
Haha!
Yeah, it does look a little spooky. I'd imagine it was the entrance to the underworld for some people. It was a huge project and undoubtedly had its casualties.