On March 31, the longest shield section of the third phase of Chengdu Metro Line 6 was completed. The double-line connection: the Diaoyuzui station -- Huilong station area is the longest shield tunneling section of the third phase of line 6. The left line is 1923.265m long, with a total of 1281 rings of pipe pieces while the right line is 1930.851m long with a total of 1286 rings of pipe pieces.