Chernobyl is about the Chernobyl Nuclear Reactor Accident.
Chernobyl is about the Chernobyl Nuclear Reactor Accident, in part to remember those that gave their lives to contain it, and in part to remember the lessons learned.
"Aftermath" is the Fireman's song, after the fire was contained. They only lived 14 days after receiving extremely lethal doses of radiation from the exploded reactor core.
"Aftermath" Lyrics:
The Angel of death is calling me,
"Come, escape your calamity",
I cling to my precious life,
It ebbs away,
Remember me,
and keep the children safe.