The Winning of the Moon

The enemy was friendly enough. Trouble was—their friendship was as dangerous as their hate!
General Finogenov notified Major Winship that the underground blast was scheduled for the following morning.
Major Winship, after receiving the message, discussed precautions with the three other Americans.
Next morning, before the sunlight exploded, the four of them donned their space suits and went and sat outside the dome, waiting. The sun rose with its bright, silent clap of radiance. Black pools of shadows lay in harsh contrast, their edges drawn with geometric precision.
Major Winship attempted unsuccessfully to communicate with Base Gagarin. Will you please request the general to keep us informed on the progress of the countdown?
Is Pinov, came the reply. Help?
Nyet , said Major Winship, exhausting his Russian. Count down. Progress. When—boom?
Is Pinov, came the reply.
Boom! Boom! said Major Winship in exasperation.
Boom! said Pinov happily.
When?
Boom—boom! said Pinov.