The ocean is humanity's largest battlefield. Resting in its depths lie the lost ships of war, spanning the totality of human history. Many wrecks are nameless, others from more recent times are remembered, honored even, as are the battles that claimed them, like Actium, Trafalgar, Tsushima, Jutland, Pearl Harbor, and Midway. Underwater exploration is increasingly discovering long-lost warships from the deepest parts of the ocean, revealing a vast undersea museum that speaks to battles won and lost, service, sacrifice, and the human costs of warfare. War at Sea is a dramatic global tour of this remote museum and other formerly lost traces of humanity's naval heritage. It is also an account by the world's leading naval archaeologist of how underwater exploration has discovered these remains, thus resolving mysteries, adding to our understanding of the past, and providing intimate details of the experience of naval warfare. Arranged chronologically, the book begins with the warships and battles of the ancient Egyptians, Phoenicians, Greeks, Romans, and Chinese, and then progresses through three thousand years to the lost ships of the Cold War. James Delgado, who has personally explored, dived, and studied a number of the wrecks and sites in the book, provides insights as an explorer, archaeologist, and storyteller. The result is a unique and compelling history of naval warfare. From fallen triremes and galleons to dreadnoughts, aircraft carriers, and nuclear submarines, this book vividly brings thousands of years of naval warfare to life.

"Indeed, to this reviewer, the chapters almost read like a binge watching session of different seasons of the individual shows he is so known for outside academia. On the other hand, just like them, given his(author's) fluent and entertaining writing style, the pages truly fly by...War at Sea will be of interest to both seasoned students of naval warfare as anyone new to the subject given Delgado's selection of shipwrecks, and not just in terms of the variety ship types covered." - Alexander Van der Biest, Instagram; paper_can_reviews

"War at Sea is an excellent overview of military nautical archeology around the globe, enhanced by decent maps, a glossary, a comprehensive bibliography, and photos and drawings, including sixteen color plates. It will interest naval and nautical historians, and likely sport divers as well." - Jonathan Beard, Michigan War Studies Review

"This book is a useful tool for educators who wish to bring more naval history into their classrooms. High school and undergraduate students will find the text lively and easy to understand, though assigning the entire book would probably best work in an upper-level undergraduate or graduate courses on oceans in world and military history. Public historians will find valuable information on artifacts and exhibits preserved in museums and private collections around the world. Scholars engaged in military history, certainly those focused on land warfare, will find material useful in expanding their view of military engagement." - Cynthia Ross, World History Connected

"James Delgado is the Sherlock Holmes of sunken warship investigation, perhaps the most respected and renowned military marine archeological expert of all time. Fascinating and dramatic, War at Sea is his most recent book, a treasury of intrigue and enigmas from the countless sunken warships that lie on the bottom of oceans, lakes, and rivers." - Clive Cussler, bestselling novelist and founder of the National Underwater and Marine Agency

"There is no finer maritime historian alive today than James Delgado. His new book War at Sea is a stunning example of his broad knowledge of all times historical beneath the sea. I strongly recommend it to anyone who is not only interested in naval history but enjoys a good story as well. A must read!" - Robert D. Ballard, discoverer of the RMS Titanic and the German battleship Bismarck

"Compelling and captivating. A real tour de force. Delgado takes the reader on a fascinating journey through the history of warships from antiquity to the present, focusing especially on the relevant shipwrecks and fragmentary remains that have been recovered by maritime archaeologists. Magisterial." - Eric Cline, author of 1177 B.C.: The Year Civilization Collapsed