This book about, the physical environment and navigation issues for the Kara, Laptev, East Siberian and Chukchi seas. Fully half of the book describes accidents induced by heavy ice conditions since 1900: 94 accidents are carefully reported and classified. Among these, the accidents involve shipwrecks, forced drift (ice jet as special case), overwintering, and various types of vessel damage. Most accounts include details such as distinguishing features, behavior of the crew, photos, and maps, which reveal ice conditions, date, location, and vessels involved (for each of four seas).