A worker performs his task in the Zhongliangshan tunnel, a key project along Chongqing Rail Transit Line 15, in southwest China's Chongqing Municipality, June 3, 2025. The 4,944-meter Zhongliangshan tunnel, the longest tunnel bored using the mining method in the second phase of Chongqing Rail Transit Line 15, achieved full breakthrough on Tuesday, marking a major progress in the construction of the city's first urban rail express line. (Xinhua/Chen Cheng)
Workers celebrate the full breakthrough of the Zhongliangshan tunnel, a key project along Chongqing Rail Transit Line 15, in southwest China's Chongqing Municipality, June 3, 2025. The 4,944-meter Zhongliangshan tunnel, the longest tunnel bored using the mining method in the second phase of Chongqing Rail Transit Line 15, achieved full breakthrough on Tuesday, marking a major progress in the construction of the city's first urban rail express line. (Xinhua/Chen Cheng)
Workers perform their tasks in the Zhongliangshan tunnel, a key project along Chongqing Rail Transit Line 15, in southwest China's Chongqing Municipality, June 3, 2025. The 4,944-meter Zhongliangshan tunnel, the longest tunnel bored using the mining method in the second phase of Chongqing Rail Transit Line 15, achieved full breakthrough on Tuesday, marking a major progress in the construction of the city's first urban rail express line. (Xinhua/Chen Cheng)
Workers are seen in the Zhongliangshan tunnel, a key project along Chongqing Rail Transit Line 15, in southwest China's Chongqing Municipality, June 3, 2025. The 4,944-meter Zhongliangshan tunnel, the longest tunnel bored using the mining method in the second phase of Chongqing Rail Transit Line 15, achieved full breakthrough on Tuesday, marking a major progress in the construction of the city's first urban rail express line. (Xinhua/Chen Cheng)
An aerial drone photo taken on June 3, 2025 shows a portal of the Zhongliangshan tunnel, a key project along Chongqing Rail Transit Line 15, in southwest China's Chongqing Municipality. The 4,944-meter Zhongliangshan tunnel, the longest tunnel bored using the mining method in the second phase of Chongqing Rail Transit Line 15, achieved full breakthrough on Tuesday, marking a major progress in the construction of the city's first urban rail express line. (Xinhua/Chen Cheng)
