ˌɑːpɚɹˈeɪʃən mˈeɪnaʊ dʒˈɜːmən: ʌntˈɜːneɪmˌɛn mˈeɪnaʊ“wʌzɐ dʒˈɜːmən ˈɛspɪənˌɑːʒ mˈɪʃən dˈʊɹɹɪŋ ðə sˈɛkənd wˈɜːld wˈɔːɹ.
Operation Mainau (German: Unternehmen „Mainau“) was a German espionage mission during the Second World War.