"...My head wails: 'Off route. Off route', like the most persistent alarm call in the world. My worse nightmare: adrift on a furtive E1. Peering over the rib into a deep groove I can see where the slug has been before. A small and fiendish move over the rib into the groove..."
Read more at http://www.ukclimbing.com/articles/page.php?id=2916