completed within 12 months. During the station's construction, on 26 May 1985, the collapse of a portion of the supporting wall led to a landslip at the construction site. Those in the nearby St Andrew's Cathedral were evacuated as a safety precaution. The church was eventually declared safe for use and operations resumed on 2 June with the collapsed area backfilled. The engineers for the construction advised the church against using the half of the Cathedral near the site. On 10 December, a Japanese foreman miner died, having fallen through a shaft. It was noted that the foreman did not have his safety belt fastened. Investigations revealed that it was entirely an accident, with all other safety measures observed. Train services commenced on 12 December 1987 when the line extension to Outram Park station was completed. The station was part of a route that ran continuously from Yishun station in the north to Lakeside station in the west. From 28 October 1989, it began to serve the NSL when MRT operations were split. In September 2000, the Land Transport Authority (LTA) installed lifts to allow barrier-free access to the station. The LTA announced plans in May 2014 to construct a new underpass between the station and the redeveloped Capitol Singapore. Construction of the underground link and the new entrance started in the fourth quarter of 2014, and was completed in the first quarter of 2015. Another linkway to Funan Centre, first announced in November 2017, was completed in December 2021. Station details City Hall station is one of two stations which are paired cross-platform interchanges between the NSL and EWL. From the north, the station is after Bugis on the EWL and after Dhoby Ghaut station on the NSL. Both lines continue and interchange at Raffles Place station. The official station code is NS25/EW13. Before the MRT eastern extension to Tanah Merah station and the Marina Bay southern extension on 4 November 1989, through services operated from the Yishun to Lakeside stations. A few days before the opening, on 28 October, transfer drills were launched for commuters to familiarise themselves with transferring between the two services: with passengers from Yishun having to alight at either Raffles Place or City Hall to continue their journey to Lakeside or vice versa. In addition to advertisement campaigns and guides about the transfers, Mass Rapid Transit Corporation (MRTC) staff were deployed at the platforms