Main structure of Asia's largest underground transportation hub completed

BEIJING -- The main structure of the underground transportation hub at Beijing Sub-center Station in the city's Tongzhou district has been completed as of Friday.

Designed with underground transportation, the system effectively alleviates the disturbance of large-scale transportation hubs on surface traffic and urban development.

On the ground level is the "city living room," which will feature over 1.3 million square meters of office and commercial space, hotels and residences.