Makeshift wooden huts were built on top of the park and some of Britain's top mathematicians moved in and tried to decipher Hitler's supposedly unbreakable communications codes. This historian says Bletchley Park was a busy place in its heyday. By war's end in 1945, some 63 million characters had been deciphered by scientists at the park. This historian says the war was shortened by two years due to the work done at the park. He says the British government doesn't help with upkeep of the park. The huts still do exist at the park, and you can also find newsreels from WWII about the park. The park survives on donations and ticket sales from park tours, and the park is in need of more funds for upkeep. And so historians and top British computer scientists are embarking on a campaign to save the park and wrote an open letter to the Times newspaper asking for the government to step in.