Singapore will conduct a nationwide safety review of ongoing sewer construction projects following a sinkhole incident near a Public Utilities Board (PUB) site on Saturday, authorities announced on Monday.

The sinkhole appeared on Tanjong Katong Road South, causing a vehicle to plunge into the cavity. The driver was rescued by workers on-site and taken to hospital for treatment.

According to PUB officials, a concrete component in a sewer shaft failed around 5:50 p.m., coinciding with the road collapse. The incident also led to water supply disruptions for 18 households in the area, as underground water mains were likely damaged by ground movement. Repairs were completed and water supply fully restored by early Sunday.

The sinkhole formed beside a 16-meter-deep shaft under construction as part of PUB’s sewer-laying works. Preliminary investigations suggest that a failed caisson ring may be linked to the collapse, though a direct connection has yet to be confirmed.

“Safety time-out” measures are now being implemented to assess similar sewer projects across the island. Ground-penetrating radar and structural analysis are underway to examine the surrounding area for further risk.

The affected area has been filled with liquefied stabilised soil to strengthen the ground. Road reinstatement work will begin once stability is confirmed.

Oversight for recovery and investigation is being handled jointly by PUB, the Building and Construction Authority (BCA), and the Land Transport Authority (LTA).

Officials have pledged transparency in determining the root cause and ensuring safety at all ongoing and future infrastructure sites. The incident has raised public concerns about construction safety standards in densely developed urban zones.