What role did hydrogen sulphide gas play in the waterworks deaths?

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Hydrogen Sulphide Gas Exposure Led to Fatalities at Choa Chu Kang Waterworks

Two workers died at the Choa Chu Kang Waterworks due to exposure to hydrogen sulphide gas. The incident occurred on May 23, 2024, when four workers were engaged in cleaning a water treatment process tank. Three workers collapsed after entering an enclosed passage beneath the tank to close hand valves.
Toxic Gas Identified as Cause of Death

Subsequent investigations by the Ministry of Manpower (MOM) revealed that the workers had been exposed to hydrogen sulphide gas. This toxic gas is known to be fatal even at low concentrations, indicating the severity of the conditions encountered by the workers.
Alarms Triggered Amidst Elevated Gas Levels

During the incident, sensors at the waterworks recorded hydrogen sulphide levels that exceeded safe thresholds. Crucially, an alarm had been triggered at the location, signalling the presence of hazardous gas concentrations prior to the workers' collapse.
Safety Lapses Led to Contractor Charges

In the aftermath of the incident, Stargroup, the contractor engaged by PUB for the tank cleaning operations, was charged for failing to implement reasonably practicable measures to minimise workplace risks. The company's authorised manager for confined space entry permits also faces charges for allegedly failing to exercise due diligence in issuing permits.

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What role did hydrogen sulphide gas play in the waterworks deaths?

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