The Błyskawica radiostation ("Lightning" radiostation) was an insurgent radio transmitter broadcasting from Warsaw during the Warsaw Uprising of 1944, since 8 August 1944 until the end of the struggle. The transmitter was constructed by Antoni Zębik pseudonym "Biegły". Its signal was the melody of Warszawianka. The first words broadcast by this radiostation, spoken by Zbigniew Świętochowski, were as following: The radio broadcast also on the medium wave a subversive program addressed to Wehrmacht soldiers, as part of the "N" Action.