About the book: 1968 / Undiscovered planet... Earth! What is going on in the depths of our planet? How can you get there? We will have to visit geologists, talk with geophysicists and astronauts, consult with power engineers and mining engineers. We will go to the deepest mine and to the seabed, take an excursion on an underground rover... Finally, geologists will take us on a flight to the Moon, Mars, Venus, Mercury, to look for subsoil treasures there too…