Nga Tu So pedestrian subway in Hanoi has been adopted by local residents as a place to do their exercise.
With no nearby leisure facilities, residents have used the tunnel which opened in 2007, to do exercise, play football or perform hip-hop dancing. From the early morning the tunnel is crowded with people doing their exercises.
The elderly use the tunnel to chat and take exercise
The tunnel is also used to play football in after school
Taking rehabilitation after an accident
Above the tunnel