DUBAI, June 30 (Xinhua) -- Roads and Transport Authority (RTA) in Dubai announced a key tunneling works of Route 2020 Project, which takes the Dubai Metro to the Expo 2020 venue, was completed on Saturday.

The tunnel stretched 3.2 km, with a depth ranging from 12 to 36 meters, said RTA. Works in the metro viaducts are set for completion in November this year, and all railway works of the project will be accomplished in July 2019.

The Dubai Metro started operations in late 2009 and currently consists of two lines, the Red Line and the Green Line. The trial run of the metro will start in February 2020.

Dubai's winning bid to organize Expo 2020 was set as a major driver to expand the Dubai Metro's network.

Dubai, the business and trade metropolis of the UAE, will host the World Expo from October, 2020 to April, 2021 as the first Arab city ever, under the slogan "Connecting Minds, Creating the Future."