Medical staff can be seen at a spot where a liquid oxygen transportation truck gets refilled at a production plant amid Covid-19 coronavirus pandemic at a hospital in Chennai on April 25, 2021. / AFP / Arun SANKAR
A tanker lorry is refilled with liquid oxygen at a production plant in Chennai as cities across India battle against a deadly Covid-19 surge. AFP 

India's Covid-19 crisis inspires national volunteer effort to save lives