Prime Minister Prayut Chan-o-cha visits the 200-metre tunnel under the Chao Phaya River which is part of a Mass Rapid Transit subway extension of the Blue Line. Drilling has been completed and the extension is expected to be opened in June 2019.
Before inspecting the tunnel, the premier attended a test run of the Skytrain's Purple Line that runs between Bang Yai and Tao Poon.