karishma vyas: as new york rose from the ashes of 9/11, first responders became america's heroes.attack again, this time from a hidden enemy. male: yo, mike, close the truck, close the truck. karishma: new york is a key battleground in the global war on covid-19. megan pfeiffer: there's been a lot of deceased people, a lotta people just waiting to die. karishma: over two weeks, we'll take you to the frontlines.

karishma vyas: as new york rose from the ashes of 9/11, first responders became america's heroes.k again, this time from a hidden enemy. male: yo, mike, close the truck, close the truck. karishma: new york is a key battleground in the global war on covid-19. megan pfeiffer: there's been a lot of deceased people, a lotta people just waiting to die. karishma: over two weeks, we'll take you to the frontlines.