 The E-grade is still an estimation of overall difficulty experienced by a climber leading a route on-sight.In 2006 the hardest grade claimed was E11 for "Rhapsody" on Dumbarton Rock, climbed by Dave MacLeod, featured French 8c/+ climbing with the potential of a 20-metre fall onto a small wire.In August 2008, MacLeod completed a new project close to Tower Ridge on Ben Nevis called 'Echo Wall'.