[arch-general] Unzip archive in which are multiple sub zip archiers?

Hi, I just get a ZIP archive and want to unzip it. I'm using unzip to unpack this archive. But when I did first unzip command, I get more ZIP archives, which have again in it more ZIP archives. Is there a command or application whic can unzip this ZIP archive and it's sub ZIP archives at once? -- Regards from Pal