![The London Underline concept from design firm Gensler seeks to transform the city's disused rail tunnels into a network of underground pathways for cyclists and pedestrians beneath the streets of the British capital.](https://media.cnn.com/api/v1/images/stellar/prod/150210132438-gensler-london-underline.jpg?q=w_5000,h_3000,x_0,y_0,c_fill/h_447)
The London Underline concept from design firm Gensler seeks to transform the city's disused rail tunnels into a network of underground pathways for cyclists and pedestrians beneath the streets of the British capital.
![The idea snagged the award for best conceptual project at the London Planning Awards last week.](https://media.cnn.com/api/v1/images/stellar/prod/150210133749-london-underline-pedestrians.jpg?q=w_5000,h_3000,x_0,y_0,c_fill/h_447)
The idea snagged the award for best conceptual project at the London Planning Awards last week.
![A number of old tube stations and tunnels currently lie dormant. However, Transport For London suggest there may not be enough to create an extensive cycle network.](https://media.cnn.com/api/v1/images/stellar/prod/140430121924-tourists-traps-london.jpg?q=w_3000,h_1971,x_0,y_0,c_fill/h_447)
A number of old tube stations and tunnels currently lie dormant. However, Transport For London suggest there may not be enough to create an extensive cycle network.
![The London Underground network is one of the oldest in the world.](https://media.cnn.com/api/v1/images/stellar/prod/150210140446-westminster-tube-station.jpg?q=w_3060,h_2040,x_0,y_0,c_fill/h_447)
The London Underground network is one of the oldest in the world.
![Stations were used as bomb shelters during World War II when the city was regularly targeted by German bombers.](https://media.cnn.com/api/v1/images/stellar/prod/150210135559-london-underground-wwii-shelter.jpg?q=w_3406,h_2454,x_0,y_0,c_fill/h_447)
Stations were used as bomb shelters during World War II when the city was regularly targeted by German bombers.
![In more recent times, disused tunnels have been transformed to host the likes of hydroponic farms.](https://media.cnn.com/api/v1/images/stellar/prod/140204101818-pkg-soares-tube-tunnel-farms-00002719.jpg?q=w_1280,h_720,x_0,y_0,c_fill/h_447)
In more recent times, disused tunnels have been transformed to host the likes of hydroponic farms.