If global heating proceeds unchecked, fatal humid heat waves could kill 3/4 of the population of India by the end of this century.

The first fatal heat waves could start much sooner than that. It only takes one of them to leave a city or even a region empty of humans.

People who are old, weak, or sick could be killed by lesser heat waves.

I wonder whether filling a bathtub with cold water and getting into it could protect a person during a fatal heat wave. It may depend on having access to refill the bathtub with more cold water when the water warms up.