On 2 September 2025, four environmental activists from Robin Wood abseiled from the Hohenzollern Bridge in Koln (Nordrhein-Westfalen). They unfurled banners reading 'Clear Track for Ecological Transformation' and 'Public Transport Instead of Tanks,' denouncing rising military spending and urging greater focus on climate protection and social justice. The action disrupted pedestrian and cyclist traffic for about three hours but did not affect rail operations.