Underwater glider

An underwater glider is like a robot fish that can go underwater and collect information about the ocean. It has wings just like a bird, which it moves up and down to make it go up and down in the water. It also has a tail that helps it turn in the water.

The glider is powered by batteries, but it doesn't need a lot of energy to move because it uses the difference in density between the colder and warmer water to keep itself going. It can travel long distances and stay underwater for weeks or even months at a time.

Scientists use underwater gliders to collect information about the ocean's temperature, salinity, and pressure, which can help them understand how the ocean works and its effect on the climate. The gliders send the information they collect back to the scientists using satellite technology, so they can analyze it from a distance.

Overall, an underwater glider is a very clever robot that can help us better understand the world's oceans and the impact they have on our planet, without disturbing the delicate underwater environment.