I recently climbed 'Polacanthus' (grade 5) at Wasserrillen, a route known for its water grooves (25-30m). It was a fantastic climb! The route followed a series of shallow water-worn depressions in the rock, providing a unique and interesting climbing experience. The holds were generally positive, but required careful footwork and balance to navigate the polished surfaces. The exposure added to the thrill, making for a memorable ascent. Definitely a recommended climb for those comfortable at the grade.