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Security and locals try to retrieve bodies of three casual labourers who drowned in a septic tank at Makindu boys high school on May 28, 2026. [Courtesy]

A father and his son are among three casual labourers who died after drowning inside a septic tank during a cleaning operation at Makindu Boys High School in Makueni County.

The incident occurred on Thursday morning at the school, located about three kilometres north of Makindu Police Station along the Nairobi-Mombasa highway.

Police said the workers had been contracted to manually drain the school’s septic tank when the deadly incident happened.