ELI5: Explain Like I'm 5

Hut 4

Hut 4 was a place where very clever people used their brains to try and figure out what secret messages the bad guys were sending during World War II. They used something called "codebreaking" to try and understand the messages even though they were very tricky and hard to figure out. They had to work very hard, sometimes staying up all night, to find the clues and solve the puzzles. When they finally figured out what the messages said, they could use that information to help the good guys win the war. Hut 4 was like a special little clubhouse where only the smartest people were allowed to go, and they had to make sure to keep everything super secret, like a big surprise party.