This is essentially a narrative encyclopedia of the sea, strung together in an entertaining mix between a coffee table book and your middle-school biology book. Some of the information is noticeably dated (I read the 1985 edition), but this didn't detract from the read as much as it led me to consider what has (or hasn't) happened over the last 25 years. Cousteau filled this book with projections and predictions. I really enjoyed the mix of science and adventure, which seems to be the essence of Cousteau's books. He was both the world's most recognizable ocean explorer and a bona fide marine biologist. A third of the book focuses on the specifics of interesting species, from whales to cuttlefish to starfish. Another third focuses on man's interaction with the sea through science, fishing, transportation, and pollution. The final third focuses on legends of the sea, exploration, adventure, and a historical look at man's interaction with the oceans. The narrative is definitely science and preservation heavy; Cousteau basically summarizes stories like Shackleton's adventure and the Titanic, but seems most comfortable in connecting the workings of the ocean world through explaining the science behind it all. At 427 pages, the book reads faster than you might expect due to the many illustrations and photographs. A page-turner only for the science savvy, but a stimulating educator for the rest of us.