The body of Rocky was fished out from the tank after an hour-long operation. He was rushed to a hospital where he was declared brought dead.
The incident took place around 8.30 PM yesterday when Rocky's mother raised an alarm in the locality about her son having gone missing. He was last seen playing near his house a few hours ago, a police official said.
A search operation was launched and the child's slippers were spotted outside the under-construction house. Police teams and locals went inside and noticed a septic tank with its lid open where Rocky's body was found.