What is a bathyscaphe? How do you use an aqualung? Could you rely on a diving bell? How do unmanned submersibles find shipwrecks? Where in the ocean is the twilight zone? In this title of the Crafty Inventions series, explore the depths of the world’s largest oceans, discover sea monsters that make their own light, such as the gulper eel and the viperfish, and look at some weird and wonderful submersibles that have helped us learn more about life on the ocean floor. Then model your own miniature Titanic, a nuclear sub with a moveable periscope, a bottle aquarium and a spooky lantern fish.