The ancient mysterious Ocean! Everything there is different from on land. At the bottom there are the deepest gorges and the highest mountains. In the water column there is an innumerable number of diverse plant and animal organisms, whose mass exceeds the flora and fauna of land. In the depths of the ocean there are strange, fantastic-looking fish. Giant storm waves and powerful tides carry billions of kilowatts of as yet unused energy. The ocean is the planet’s reservoir, a flywheel of climate and weather, a spacious road that does not require construction or repair, a source of almost inexhaustible supplies of animal food and chemical elements. Such is the majestic Ocean, which occupies three quarters of the Earth's surface. In this book, the reader will find a fascinating, publicly accessible story about the achievements of world and Soviet oceanology and about many solved and unsolved mysteries of the ocean.