What happens when you put stuff in the ocean? Buoys, anchors, robots, cables, sensors—all of them have to survive one of the harshest environments on Earth. In this class, we’ll talk about real ocean robots and chemical sensors used by scientists to study seawater and the engineering challenges they face when saltwater, electricity, and time all work against them. Then, you’ll step into the role of an ocean engineer. You’ll see how metals change in salty water and why material choice matters for long-term ocean instruments. You’ll then speed up corrosion to create your own custom-etched keychain! If you’re curious about the ocean, robotics, or how real science tools are designed to survive extreme environments, this class is for you. No prior experience needed!