On 17 January 2013, the Land Transport Authority (LTA) announced 'Circle Line Stage 6' which will 'close the circle', set to be completed by 2025. The 4 km extension will run between Marina Bay and HarbourFront. The extension will connect commuters between the HarbourFront to Marina Bay stations and expand the rail network to the southern edge of the Central Business District. On 29 October 2015, LTA announced the station locations for Stage 6, with the working names of the stations being Keppel, Cantonment and Prince Edward. Tenders were called for construction between 2016 and 2017.