The book by Georgios Karelas, "The Unknown Patraikos," is a historical edition aimed at the general public and sheds light on unknown aspects of the Patraikos Gulf – a maritime area with a decisive role in the history, economy, navigation, and memory of the region.

The book is a journey through time and the depths: from prehistoric times to the modern era, from great naval battles to the silent shipwrecks resting beneath the calm waters of the gulf. With a narrative style and based on extensive primary research, it combines historical evidence, rare photographic material, archival sources, and oral testimonies.

Special emphasis is given to the historical shipwrecks and underwater cultural heritage, as well as to the modern environmental dimension of Patraikos. The book also serves as an invitation to raise awareness for the protection of the sea and the memory it hosts.