An aerial view of Choa Chu Kang Waterworks (CCKWW) in Singapore, where three workers were found unconscious while carrying out routine tank cleaning. — PIC COURTESY OF SINGAPORE INTERNATIONAL WATER WEEK’S FACEBOOK
An aerial view of Choa Chu Kang Waterworks (CCKWW) in Singapore, where three workers were found unconscious while carrying out routine tank cleaning. — PIC COURTESY OF SINGAPORE INTERNATIONAL WATER WEEK’S FACEBOOK

KUALA LUMPUR: A second Malaysian worker died on Tuesday after inhaling poisonous fumes while cleaning a tank for Singapore's national waterworks agency.

According to the Straits Times, the 24-year-old Malaysian, who was in the intensive care unit (ICU) at Ng Teng Fong General Hospital, died at about 10pm on May 28.

This was based on a statement from the National Water Agency (PUB).

On May 23, Bernama reported that one sub-contractor worker had died while two others were admitted to the Ng Teng Fong General Hospital's intensive care unit.

The workers were found unconscious while carrying out routine tank cleaning at the Choa Chu Kang Waterworks (CCKWW) plant in Singapore.

A PUB spokesperson said the incident occurred at 11.15am on May 21 and a preliminary investigation revealed that the foreign workers had inhaled hydrogen sulphide, a gas produced from sludge, a by-product of the water treatment process.

The agency said it was in touch with its contractors and rendering support to the workers' family members.