On 25 January 2019, the
Land Transport Authority (LTA) announced that Aviation Park station would be part of the proposed
Cross Island Line (CRL). The station will be constructed as the eastern terminus of phase 1 & 2, which will consist of 18 stations between this station and
Jurong Lake District station. It was expected to be completed in 2029. However, the restrictions imposed on construction works due to the COVID-19 pandemic led to delays and the CRL1 completion date was pushed by one year to 2030. On 8 March 2021, the LTA awarded Contract CR105 to
Taisei Corporation –
China State Construction Engineering Corporation Limited Singapore Branch Joint Venture. Construction works for the tunnel started in the second quarter of 2021 and is targeted to be completed by 2030 when CRL1 commences passenger service. For the first time, the LTA used a large-diameter tunnel boring machine to construct a single tunnel with two tracks in it. Another contract for the construction of tunnels between this station and
Changi East Depot was awarded on 16 December 2021 to a joint venture of Shanghai Tunnel Engineering Co (Singapore) Pte Ltd and LT Sambo Co Ltd (Singapore Branch) at S$780 million (US$ million). The of tunnels are being built underneath Aviation Park Road, with an average depth of . On 8 November 2021, the contract for the design and construction of Aviation Park Station and associated tunnels (Contract CR103) was awarded to Hock Lian Seng Infrastructure Pte Ltd at S$320 million (US$ million). Construction started in the first quarter of 2022, with the station targeted to complete in 2030. Due to the station's proximity to
Changi Airport, construction works have to comply with aviation height restrictions. The soil, largely made of soft marine clay, had to be stabilised using an earth retaining stabilising structure for excavation works. The contract for the design and construction of tunnels between this station and the
Changi East Depot was awarded to a joint venture between Shanghai Tunnel Engineering Co (Singapore) Pte Ltd and LT Sambo Co. Ltd. (Singapore Branch). The S$780 million (US$ million) construction project would involve tunneling up to deep. ==References==