Check out this cool underwater robot that inspects hydropower turbines

GE Renewables has launched a first-of-its-kind underwater robot that can inspect hydropower turbines faster, more easily, and safely than humans can. GE Hydro Solutions' underwater turbine inspection robot, which GE describes as the size of a "beaver," can inspect hard-to-reach areas of any type of hydropower turbine without taking the equipment out of the water. In fact, it's able to inspect between turbine runner blades within openings of less than 200 mm – that's under 8 inches. The inspection robot can detect all the same things as the traditional, time-consuming, expensive inspection method, which involves taking units offline, draining the turbines, and sending people into dark, confined spaces. Potential problems to look for include erosion, cavitation, corrosion, impact marks, and the presence of foreign bodies, according to GE. The robot's onboard camera provides clear images, and it also records what it sees on video for further analysis.