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At 15:18 on July 19,amid cheers from Chinese and foreign employees,no2 TBM slowly broke through the wall and drove out.The Tangdong Line,the sixth subway line in Singapore,runs 43 kilometers underground from north to south of the country.
On the morning of July 10, the right line of the shield section of the Jimingshan Road Station of the Hefei Rail Transit Line No. 4 to the Science City Depot was successfully penetrated and became the single-line section tunnel of the 21st line of Line 4.
31th May,Mexico Sur de Texas-Tuxpan natural gas pipeline completed.This natural gas pipeline is located in the between Brownsville,Texas,USA and Veracruz Mexico,the length is 500 miles(about 805km),cost 3.1 billion US dollars,is the first subsea tunnel in