More than half a century ago, at the height of the Cold War, by government decree, one of the Soviet military submarines was taken out of service and converted for scientific research. She was given the name "Severyanka". For the first time in the world, a submarine began to serve exclusively the purposes of science. Vladimir Azhazhe, a ufologist with thirty years of experience, a retired submarine officer, and his colleagues had the opportunity to accomplish what Jules Verne and other science fiction writers only dreamed of - to look through the windows of a submarine into the secrets of the depths of the sea.

On the creation of a unique scientific underwater vessel, expeditions to the North Atlantic and the Barents Sea, unexpected discoveries and meetings with unknown inhabitants of the deep sea, the hard work of submarine discoverers, their courage, this book, designed for a wide range of readers, tells the story.