BWSSB STP Tank: 21+ Hours On, Two Workers Missing in 40-Foot Varthur Sewage Tank

A rescue operation is continuing in Varthur, east Bengaluru, after two workers went missing inside a 40-foot-deep sewage tank at a BWSSB sewage treatment plant on June 18 around 6 p.m., when three labourers were reportedly involved in a fall inside the confined structure, leaving one worker rescued and under treatment while two others-identified as Brijesh and Akhilesh-remain missing even after more than 21 hours of continuous search efforts.

The incident happened at a BWSSB-operated sewage treatment plant in Varthur, an expanding urban zone in east Bengaluru, where workers were engaged when they allegedly fell into the deep sewage tank. The structure is known for hazardous conditions, including toxic gases and low oxygen levels, which have made rescue operations extremely difficult.

As the rescue operation crossed the 21-hour mark, NDRF teams along with BWSSB officials and local authorities continued search efforts inside and around the tank. Rescue teams have been working to reduce toxic gas concentration and stabilise oxygen levels before attempting deeper entry into the structure, while wastewater flow inside the tank has further slowed progress.

The rescue is being carried out under highly risky conditions, with experts noting the presence of toxic gases such as hydrogen sulphide and methane inside confined sewage infrastructure. Due to these conditions, direct entry remains restricted, and teams are proceeding cautiously to avoid additional casualties.

BWSSB Chairperson N. Manjula visited the site and directed officials to intensify search operations. She also ordered a detailed inquiry into the incident and said action would be taken if any negligence or safety lapse is identified.

A three-member committee has been formed by BWSSB to investigate the circumstances of the incident, including whether proper safety protocols, protective equipment, barricading and supervision were in place at the time of the accident. The committee has been asked to submit its report by June 20.

Police officials said further action will depend on the outcome of the rescue operation and the findings of the investigation. Statements from officials and witnesses will be recorded once the search concludes.