Passage: Within a short time, however, Greece's own independence would be challenged. By 1940, Italy invaded, and in 1941 the German army occupied the country. Despite the repressive regime, she continued performing, and in 1942, she even opened up her own nightclub, Krystal, together with her son Paraschos, with whom she had since been reunited. Although she was a Jew, she had managed to obtain a fake baptismal certificate, though her safety was also ensured by an affair she had with a German officer.

Question: What did Krystal open up in 1942?
nightclub