It is Sept. 25, 2016, 10.44 am local time in Doha at Hamad International Airport when a 7-m (23-ft) tunnel boring machine (TBM) pierces the final target wall of the “Red Line South.” It is the last of 76 breakthroughs in the gigantic milestone project Doha Metro. The TBM breaking through marks the spectacular finale of one of the most ambitious tunnel structures in the world. Cleverly master-planned and highly professionally directed by client Qatar Rail, it took just 26 months to provide the capital of Qatar with three city-wide metro lines: 111 km (68 miles) of brand new, ultra-modern metro tunnel systems. Where before there was nothing, at peak times 2.5 km (2 miles) of tunnel per week were added underground and the result was more than just an entry in the Guinness Book of Records.
