About the book: 1961 / The author of this book, a young scientist Vladimir Azhazha, is a happy man. He and his comrades had the opportunity to accomplish what Jules Verne and other science fiction writers had only dreamed of - through the windows of a special submarine ship to look into the secrets of the sea depths. In 1957, by decision of the Soviet government, the modern combat submarine was disarmed and refitted. This is how Severyanka was born - the world’s only underwater research laboratory. This exciting book tells about its creation, first voyages, unexpected discoveries and meetings with still unknown inhabitants of the deep sea, about the hard work of the submarine discoverers, about their friendship and courage. [Adapted for AlReader]