what is the theme of "A Noiseless Flash"?

Question

1. Chance alone determined who survived the attack
2. Many individuals anticipated the nuclear holocaust
3. People respond methodically in emergencies
4. All people suffer equally in war

Answer 1

Each survivor sees the huge flash differently but the significance of the life-changing event is not yet apparent. From this point on, even though Hersey tells his story factually, the real drama is actually only beginning as he follows the lives of these six people as they struggle to survive against terrible odds.
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chance alone, I bet. they were used to seeing weather American planes flying low.

Quite a sad tale about Hiroshima by John Hersey. More here: