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A few years ago Stephane Ouaja did some questionable routing across a hiking trail (I think also in the Alps) and got stuck in the middle of the night. He was on some super steep goat trail that would be hard to hike during the day let alone bike pack on in the dark. He posted a video while he was up there saying how badly he'd fucked up and that nobody else should ever attempt that route.
e: found the vids
https://www.youtube.com/watch?v=dLZNOVhMYRE
https://www.youtube.com/watch?v=BFa4tlgsmfg
He's just past this google maps panorama, right where the road ends and it turns to hiking trail. Hopefully he has time to get across before it gets dark and he does a Stephane.
https://www.google.co.uk/maps/@45.081103,6.508108,3a,75y,297.41h,90.33t/data=!3m8!1e1!3m6!1sAF1QipMBF4iMzmfrlbmUjZCp0H1j9Fat2KH7c1a9jbcJ!2e10!3e11!6shttps:%2F%2Flh5.googleusercontent.com%2Fp%2FAF1QipMBF4iMzmfrlbmUjZCp0H1j9Fat2KH7c1a9jbcJ%3Dw203-h100-k-no-pi-0-ya257.07507-ro0-fo100!7i11776!8i4270