The flooding of the tunnels between the Bishan and Braddell MRT stations was caused by heavy rain and a faulty maintenance pump.

This prompted the train's operator, SMRT, to suspend all service from Ang Mo Kio to Marina South Pier.

[4] At 7:07 p.m., the Singapore Civil Defence Force (SCDF) received a call from SMRT about a flooding situation in the tunnels between the two affected stations.

[10] SMRT also fired eight employees from their maintenance crew — including a senior executive, two managers, and five members of the technical staff — as a result of the incident.

[8] To prevent such an incident from occurring again, the train operator introduced flood-prevention measures at four other tunnel portals along the East West line in 2018.