Earlier this year, I watched a YouTube video of a fellow who toured from Bergen Norway to Nordkapp along which he had to go through several tunnels. The last one is the longest of them, 6.875km (23,556ft) in length and drops from sea level to 212m (696ft) below sea level (Wikipedia). At the entrance to the tunnel is a sign warning of a 9% grade!!! The first stage of the Arctic Tour of Norway went up to Nordkapp through that tunnel. Bringing it back to touring, I'd love to make that trip from Bergen to Nordkapp.