One labourer died and another is in critical condition after the two fell into a septic tank while cleaning a Sewage Treatment Plant (STP) at a building in Powai on Wednesday morning, officials said.

According to the Mumbai Fire Brigade (MFB), the incident was reported around 10:42 am from the Raj Grand Doi Building, located opposite Hiranandani Hospital in Powai. The two men, both labourers from Ultra Tech Pvt. Ltd., were reportedly engaged in cleaning work inside the STP when they suffocated due to toxic gases and got trapped inside.