Τhis book is a guide to the wonderful world of the Greek seas and the Mediterranean. It presents a large number of species of marine flora and fauna which the diver can find on the seabed, without the use of special equipment. It is embellished with more than 1300 photographs which were taken on free dives, a fact which demonstrates the accessibility of this stunning underwater world. The photographs are accompanied by informative texts which provide a plethora of data relating to the characteristics of each species, its habitat, and its distribution, making the book an essential aid to the understanding of marine life.