Japanese diplomat Chiune Sugihara and his wife Yukiko spent 18-20 hours a day writing and signing transit visas by hand in Lithuania for more than 6,000 Jews for 29 days from July 31 to August 28,1940.

When it was time for them to depart, Sugihara said, "Please forgive me. I cannot write anymore. I wish you the best." When he bowed to the people before him, someone exclaimed, "Sugihara. We'll never forget you. I'll surely see you again!" It is estimated that actions undertaken by him and his wife are responsible for the present lives of around 100,000 people.

Source: @historycoolkids