On Friday, a city worker was trapped in the water tank of the Honouliuli sewage treatment plant in Ewa Beach and died.

The Honolulu Fire Department received a 911 call at 10 a.m., requesting a “confined space” rescue at the facility. Six rescue units and approximately 26 workers responded to the call.

The sewage treatment plant is used to treat sewage from the central and western regions of Oahu.

Due to federal regulations, a dangerous goods team was first deployed to check the air quality in the tank to determine if it is safe for the rescue team to enter. Once the dangerous goods unit believes that the area is safe, the rescue team can rescue the workers from the tank.

The worker was transferred to the Honolulu Emergency Medical Service Center at 10:39 am. The city did not elaborate on the worker's condition at the time of the rescue, but confirmed that the worker had died.

Currently, the cause of death of the worker is still under investigation. No other details are immediately available.

"[Honolulu] Mayor [Rick] Brown Giardi expresses our deepest sympathy and condolences to the bereaved family members," the city spokesperson said in an emailed statement.

"This city mourns the loss of our dedicated city employees."

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