In December 2013, a 4.3-m (14.1-ft) Robbins double shield tunnel boring machine (TBM) emerged from boring a 9.3-km (5.8-mile) headrace tunnel in Turkey's Adana province for the Yamanli II hydroelectric project. The hard rock TBM broke through on time, due to excellent advance rates and minimal downtime for the duration of the project.
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