According to
http://8a.nu/site2/:
Babel - new 8C/+ by Koyamada
"On 30th January, I completed a three years' project at Shiobara. There are 30 moves in a 12 meter roof.
I felt it somewhat harder than 8C so I graded it 8C/C+. Looking forward to get repeaters' opinions."
I wouldn't normally post this but that last sentence really made me laugh
