"By the craters of Luna," yelled Strong, "what was that?"

"One of the smaller screens has given way, sir!" yelled the chief
electronic engineer after a quick glance at the giant control board.
"Number seven."

Walters struggled to his feet. "Where is it?" he demanded.

Strong and Kit got to their feet and crowded around the commander as the
engineer pointed out the section on the huge map hanging on the wall.

"Here it is, sir," he said. "Sector twelve."

"Has that area been evacuated yet?" asked Strong.

"I don't know, sir," replied the engineer. "Captain Howard was in charge
of all evacuation operations."

Walters spun around. "Get Howard, Steve. Find out if that part of the
city has been cleared," he ordered and then turned to Kit. "You, Kit,
take the Space Marines and round up every spare oxygen mask you can find
and get it over to that section right away. I'll meet you here"--he
placed his finger on the map--"with every jet car I can find. No telling
how many people are still there and we have to get them out."

Almost immediately the wailing of emergency sirens could be heard
spreading the alarm over the city. At the spaceport, where the citizens
were waiting to be taken off the satellite, small groups began to charge
toward the loading ships in a frenzy of fear. Since Titan had been