Dubai: The Metro project has achieved another milestone with the completion of tunnelling work for the Red Line, said a senior official… “Two tunnel boring machines (TBMs) have broke through the tunnels marking the completion of tunnel work for more than three-and-half kilometres of underground track of the Red Line,” said Adnan Al Hammadi, Director of Construction at the Rail Agency of the Dubai Roads and Transport Authority (RTA).

The tunnel that connects Union Square Station to Riqqa Station is 948 metres while the length of the tunnel that connects Riqqa Station to Deira City Centre Station is 1,168 metres…SOURCE