CONSTRUCTION of Huaihai Road M. Metro station, a key stop on the second phase of Line 13, reached a major milestone yesterday with the completion of tunneling work.

Working at up to 71 meters below ground, four tunnel-boring machines took more than five months to create the core infrastructure for the new station, the main body of which is 33m underground, the subway operator said yesterday.

Once completed, Line 13 will stretch more than 33 kilometers from Jiading District to the Pudong New Area and feature 31 stations.