Four men Bengaluru’s Doddaballapura died inside a manhole because of asphyxiation.

Two BWSSB contract labourers, named Jagannath and Gounder, got stuck in a manhole while cleaning it. Two other men who got into the manhole to help them also eventually died.

According to a police source at Doddaballapura town police station, two factory workers named Muniraju and Madhu, who were passing by the manhole at around 2:30 pm on Sunday afternoon. They heard the contract labourers screaming from inside the manhole.

"They hear the contract labourers shouting from inside and jumped in to help them. The fire and emergency department took the men to the hospital where they were brought dead," he said.

The source said that the Doddaballapura police has detained the BWSSB contractor, however no complaint has been lodged. 

In December 2015, three migrants labourers in Bengaluru, died after descending into a sewage treatment plant in a residential apartment complex in Bengaluru’s Electronic City area.