This book is for those who are interested in exploring the world, who love nature, adventure and extreme situations. It is based on the impressions received by the author during his field expeditions to the currently active Kudryavy volcano of the Kuril ridge. The extreme working conditions of scientists in the active crater zone are interestingly and vividly described, including an eruption during which the author, in order to save his friends, climbed an active volcano and saw everything that happened with his own eyes. The author's encounters with bears are also fascinatingly depicted, one of which almost cost him his life. Contemplating the world around him, the author soulfully conveys the feelings that arose when communicating with wild nature. For a wide range of readers.