Air raid sirens were a familiar warning system across German cities during the Second World War, sounded to send residents to shelters before attacks. The 1945 label on this clip points to that final wartime year, while the EAS wording is a modern soundboard label borrowed from emergency alert systems. Shared online as a short alarm effect, it has become shorthand in edits and memes for an incoming raid, a national emergency or an exaggerated disaster warning, long after the original wartime sirens fell silent.