"I need another five minutes!" answered Roger. "I have to set the signal to send out the SOS."
"Will it send out _anything_?" asked Tom.
The _Polaris_ rocked again from a second explosion.
"I don't know, Tom," yelled Roger. "I haven't even tested it!"
A third explosion jarred the rocket cruiser and the curly-haired cadet knew that the air lock must have been demolished by now.
"Bring down what you've got, Roger!" he yelled. "We'll just have to take a chance that it'll work. And grab yourself a space suit on the way down. When they blast through the inner portal of the lock, we'll need 'em!"
"Right!" replied Roger. "Be down there in a second."
Astro and Tom hurriedly donned space suits and waited for Roger to bring the beacon. In a moment the blond-haired cadet appeared with the hurriedly contrived beacon. Tom quickly placed it between the two hulls and sealed the hole in the inner hull.
A fourth explosion rocked the ship and the three cadets knew that by now the air lock had been blasted away. They put on their space helmets and climbed the ladder to the upper deck.
Coxine met them near the air lock, two paralo-ray guns clutched in his gloved hands. Behind him, his crew swarmed in and fanned out all over the ship.
But the space pirate stood on the control deck, glaring at Tom. "Whaddya know! The Space Kid himself!"
"That's right, Coxine," said Tom quietly, "only the real name is Corbett."
Suddenly there was a triumphant shout from one of the pirates. "Skipper! The credits! All twenty million! We found 'em!"
Over their spacephones the three cadets could hear the pirates yelling and cheering. Coxine bellowed for silence and the cheering quickly subsided.
Paying no further attention to the three cadets, the pirate captain ordered his men to repair the hole in the air lock and prepare for immediate acceleration. There was a triumphant gleam in his eyes as he announced their destination.
"With the Solar Guard on the other side of the belt, we're going to hit the richest prize in the universe! The colony on Ganymede!"
He then turned and smiled at his three prisoners, adding menacingly, "And we've got three passes to get us through the defenses!"
Ganymede, the largest moon of Jupiter, was an important way station of the Solar Alliance for all spaceships traveling between the outer planets of Saturn, Uranus, Neptune, and Pluto and the inner planets of Mars, Earth, Venus, and Mercury. The colony on Ganymede was more of a supply depot than a permanent settlement, with one large uranium refinery to convert the pitchblende brought in by the prospectors of the asteroids. Refueling ships, replenishing supplies, and having a small tourist trade, it was a quiet colony, one of many spread throughout the system.