Question

how did iswaran came to know that the factory where they were working was once a burial ground ​

Answer 1

Iswaran came to know that the factory where they were working was once a burial ground as Iswaran said in the story-" I knew on the first day itself when I saw human skull lying on the path. Even now I come across a number of skulls and bones."

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Answer 2

Iswaran came to know at the first day when he was going to buy a grocery\vegetable , he got a many skull and human bones