Welsh Water's work to take the sewage from Plasdŵr to connect into the main foul sewer which happens to be on the other side of the river is conintuing. This means taking the sewer under both the railway and the river. To connect in to the main sewer they are building a pumping station in Hayley Park and tunnelling under the river.

You can read upates on progress and the timetable for completing the work here https://inyourarea.digdat.co.uk/dwrcymru?id=PlannedWork.425