The water flow also reportedly broke the basement door.
Three students were killed after they were trapped for over four hours when water suddenly gushed into the basement of a popular coaching centre in Delhi on Saturday.
The victims have been identified as Tania Soni, Shreya Yadav -- both aged 25 -- and Navin Delvin, 28. While Tania was from Telangana and Shreya from Uttar Pradesh, Navin was a resident of Kerala.
They were all civil service aspirants.
Visuals from West Delhi's Old Rajendra Nagar showed the basement of Rau's IAS Study Circle completely flooded on Saturday evening.
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Fire brigade officials said they received a call about students being stuck in the basement at 7.19 pm and five fire engines were dispatched to assist in rescue operations, which took seven hours to conclude.
A National Disaster Response Force (NDRF) team was also called in to assist in the rescue operation.
The bodies of two female students were pulled out hours after the rescue operation began, while the body of the third student was recovered later into the night.
Police have detained the owner and coordinator of the coaching centre and have filed a case under charges of culpable homicide among other charges against them.
What May Have Led To Flooding
Preliminary investigation suggests that the basement housed a library - with a seating capacity of about 150 people - where several students were present when water suddenly entered.
The investigation has revealed that the coaching centre was built in a street that was on a slope, one of the reasons why water after heavy rain may have reached the institute so quickly. The water flow also reportedly broke the basement door.
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It is also being probed whether the flooding was caused due to the overflow of the sewer drain on the street.
According to a police officer, the furniture in the institute started floating when it was flooded, creating an obstruction in the rescue operation.
The tragic incident comes days after a UPSC aspirant was electrocuted while trying to cross a waterlogged street in Patel Nagar, which is also in West Delhi.