Immediately Dr. Rhodes takes one of the rocketship's two lifeboats and flies it into the rings. Radio contact is lost as the signal is lost in intense static. While waiting for radio contact to resume, Bruce and the others find artefacts, signs that an alien city once occupied the ground on which they stand and has since crumbled into the gravel on which their ship and camp sit. When radio contact still has not been reestablished and only one day remains before the expedition must leave Saturn to return to Earth, Bruce takes the other lifeboat and flies into the rings. With some effort and luck he finds his father, whose rocketboat had broken down, and the two men return to Mimas just in time to see Garcia and Benz take off in their rocketship and head for Hidalgo. So intent are Garcia and Benz on running the ship that they don't notice the lifeboat landing behind them. Marooned, the Rhodeses decide to write down descriptions of their discoveries for future explorers to find. While the Rhodeses are exploring, two of the villains arrive, but an old Saturnian cannon destroys their ship and kills them. In the wreckage of the ship Bruce and his father find three fuel tanks, intact and full. With nothing to lose, they fuel up an old Saturnian rocket and blast off. Shedding parts as it goes, the rickety craft barely gets the men to the asteroid Hidalgo, where Garcia and Benz run to greet them and the four men settle down for a long and successful journey to Earth. The book was reviewed by “Another father and son team of scientific superiority, sally to Saturn – to prove their innocence and even an old score with a greedy gang who want to blow up the moon for the minerals therein. The secret of Saturn's rings, finds Dr. Rhodes, ousted head of the Terraluna mining operations, is that they were once moons which, blown apart, formed rings just as our own moon would do under the pressure if atomic bombing were used to extract the uranium at its center. The concurrent excitement is commensurate with the plot.” Notes Sources  The book is listed at