0
Edouard, a colleague, gave me the link of a very rich urbex website. If you like this kind of exploration I recommand you to have a look on it.
In this page you can access lots of photos and stories about various urbex session (including a visit in Paris).
I found the video on this website. It's an immersive example of an exploration, with its moments of fear, doubts and discoveries.
UNDERCITY from Andrew Wonder on Vimeo.