Okay kiddo, so Operation Wunderland was a secret mission done by some very important people a long time ago. This mission happened in a very cold, snowy place called the Arctic.
The people who did this mission were part of a country called Germany, and they wanted to know more about what was happening in the Arctic. But since it was so cold and dangerous, they had to be very sneaky and careful.
They took a special kind of ship called an icebreaker, which could break through thick ice in the ocean. They also had planes to fly over the area and take pictures.
When they got there, they found out a lot of really important things about the Arctic. They learned about the temperature, the weather, and how the ice was moving.
But since this was a secret mission and other countries didn't know about it, some people got mad and thought it wasn't fair. So, even though it was a cool adventure, it also caused some problems.
Overall, Operation Wunderland was a really big deal and helped people learn a lot about the Arctic. But it was also a secret mission that caused some controversy.