Deep below Jakarta’s traffic-choked streets, a warren of transit tunnels could prove the key to easing the city’s crippling gridlock. Every day millions of commuters make the tortuous slog to work in slow moving cars and on motorbikes in the oppressively hot, smog-choked Indonesian capital. But hopes are high that the completion of an underground rail network could provide a solution to the worsening traffic problem in one of Asia’s largest cities. Construction of the Mass Rapid Transit (MRT) system is approaching its final phase, with building set to finish next year and commuters expected to be able to use the service from March 2019. Beneath the iconic Hotel Indonesia roundabout in central Jakarta, workers are toiling around the clock to lay tracks in the cavernous concrete tunnels that will eventually whoosh residents around the city.