The incident occurred last night when a labourer first entered the 10 ftdeep manhole without any protective measures and on not hearing fromhim for a long time another also went inside.
Due to suffocation he shouted for help, upon which the tractor driver who had accompanied them also entered the manhole to rescue them.
All the three might have died due to suffocationbecause of toxic gases inside the manhole, officials said,adding that their bodies were recovered hours later.
BWSSB officials said the workers were involved by the contractors to clear the clogged line and the board was not intimated before starting the work as per procedures.
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Also expressing surprise about the work being undertaken late in the night, they said contractors were supposed to use jetting machine to clean the manhole.
Minister for Bengaluru Development and State TownPlanning K J George and Bengaluru Mayor G Padmavathi who visited the site have assured strict action against those responsible.
He said "...Merciless action will be taken against those responsible. Negligence is the main cause, despite laws labourers have been used for this work. Strict action will be taken."
George also said that Rs 5 lakh compensation will begiven from BWSSB, and the contractor will be penalised.
Police said they have registered a case and a probe was on.
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