“What a powerful body!” he thought. “No matter how many rounds of
machine gun fire were let loose on him, the bullets just ricocheted off. If
machine guns won’t do the trick, would a cannon? Aerial bombardment
maybe? . . . No, wait a sec. Godzilla managed to withstand the radiation of
a hydrogen bomb without dying . . . That’s what the professor said, right?
So what then?”

Godzilla: Godzilla in Tokyo
The Tokyo Godzilla Society