Handling the lead-encased charges carefully, the six spacemen loaded the jet boats and, one by one, blasted off from the Polaris to positions marked on the map.

Working rapidly, each of the teams of two moved from one position to another on the surface of the desolate satellite. Connel, referring constantly to his watch, counted the minutes as one by one the teams reported the installation of a reactor unit.

"This is Shinny. Just finished installing reaction charge one at point seven ..."

"This is Manning. Just finished installing reaction charge at point four ..."

One after the other, the teams reported. Connel, with Tom piloting the jet boat, finished setting up their units at points one, two, and three and headed back to the Polaris.

"How much time, sir?" asked Tom as he slowed the small craft for a landing.

"Less than a half hour, Corbett," said Connel nervously. "I'd better check on Shinny and Alfie." He called into the audiophone. "Major Connel to Shinny and Higgins, come in Shinny—Higgins!"

"Shinny here!" came the reply. "We're just finishing up the last unit. Should be back in five minutes."

"Make it snappy!" said Connel. "Less than a half hour left!"

"We'll make it," snorted Shinny.