Love your pictures, especially the shots showing the infrastructure and everyday life.
Thanks for the kind words. There are more photos and a description of them on the blog post: http://regex.info/blog/2017-03-03/2781
When you leave your breakfast on the floor, you know you gave 100%.
Hadn't had breakfast, which perhaps is part of the reason it took so much out of me (so to speak)
Your ugly building looks like some sort of ventilation for the tunnel.
Part of it seems to be, but it's HUGE compared to similar structures for comparable tunnels. So who knows.....