Hanoi plans to move parking, shops, transit and utilities underground into one connected network, easing a surface running out of room, under a master plan that treats the underground as a "second city".

Hanoi plans to move parking, shops, transit and utilities underground into one connected network, easing a surface running out of room, under a master plan that treats the…

Hanoi plans to move parking, shops, transit and utilities underground into one connected network, easing a surface running out of room, under a master plan that treats the…