It started operations on 21 October 2017 , officially opened by the Transport Minister Khaw Boon Wan .
Stage 3 of the Downtown line is 21 - kilometre ( 13 mi ) long and serve 16 stations .
Stage started operations on 21 October 2017 , officially opened by the Transport Minister Khaw Boon Wan .
Stage 3 of the Downtown line is 21 - kilometre ( 13 mi ) long and serve 16 stations .