To reach certain places on Earth, we must cross miles of open water. Whether by plane or boat, there's always a chance of disaster, and the ocean is a dangerous place to be alone without transport. Readers learn what to do should they be left in open water or stranded on an island, including how to get food and water. True stories of those who have survived shipwreck exemplify the courage and resourcefulness needed in scary situations. Readers use their critical-thinking skills to answer multiple-choice questions about similar situations as they learn about the ocean ecosystem, including its hidden dangers.