Isnt RV wrong?

Rv said in hospital to police and family that because there is hole in coffin Purvi is in this condition

Hes wrong, if there was no hole Purvi would have died immediately after burial

Purvi would not live till RV reached her in first place

That hole in coffin supplied oxygen to Purvi and saved her life

Yes rain water filled up through that hole but it saved her life probably

Or who lives after being buried alive for even a minute would not oxygen stop means person will die in 1 minute

I think this scene is lifted from real life crime

In bangalore a husband had buried his wife alive for property in real and told all shes gone here there. Its inspired by that incident

Here is link to story

https://www.bbc.com/news/world-asia-india-65397222