With the highest population of its 2,000-year history, London is having to think creatively about maximizing the utility of existing infrastructure. Running beneath London is an extensive system of dormant tube tunnels, exchanges and stations that Gensler envisions transforming into a dynamic network of bike and pedestrian paths, as well as cultural and retail spaces. Designed collaboratively with Momentum Transport Planning and Pavegen, The London Underline harnesses the kinetic energy of pedestrian footfall to generate its own energy, creating a vital link between urban infrastructure and the people that use it, and showing how integral sustainable transit is to a vibrant public realm. The 2015 London Planning Awards selected The London Underline as its “Best Conceptual Project.”