The fourth book in the “MTA” series is the work of one author, already known to a fairly wide circle of readers who became acquainted with his “Big Children of the Sea” with interest. The new book continues to tell about the new journeys of Captain Alexander, Boatswain, Navigator and other heroes. The author is not limited to describing adventures; his book contains a lot of interesting and useful information about the seas, islands, sea animals, and historical events.