探上海嘉闵线施工区域塌陷现场：正在用混凝土灌注，完工时间待定

Group 1 - The core area of the collapse near the Qixin Road subway station in Shanghai occurred on February 12, with multiple departments involved in the repair work, including subway, telecommunications, and construction teams [2][6][9] - The repair efforts are primarily focused on water extraction and concrete injection, with no clear completion time provided [6][11] - The collapsed area was previously identified as a leakage zone and had been sealed off prior to the incident, with no casualties reported [9][14] Group 2 - The construction area is managed by China Railway Tunnel Group, a state-owned enterprise specializing in tunnel and underground engineering, with a comprehensive service system covering investment, design, research, construction, and operation [14] - The Shanghai Jianmin Line, also known as the Shanghai Metro Jianmin Line, is an under-construction urban express line approximately 44 kilometers long, with a total investment of 37.101 billion yuan and a construction period of about six years [14]