"The Cruel Sea" is a novel written by Nicholas Monsarrat, published in 1951. It tells the story of the British Royal Navy's efforts during World War II, focusing on the experiences of a corvette crew in the Atlantic Ocean. The narrative explores themes of camaraderie, sacrifice, and the harsh realities of naval warfare. The book is notable for its realistic portrayal of life at sea, including the dangers posed by enemy submarines and the relentless nature of the ocean. It has been adapted into a successful film in 1953, further popularizing its gripping depiction of wartime challenges.