"1.6" . . "8.9" . . . . . "''Biber'' (submarine)" . "''Biber''" . . . "Biber" . . . . "Biber submarines" . . . "Biber submarine" . "Biber 90" . "German ''Biber'' midget submarine" . . "Biber (submarine)" . "Biber (submarine)" . "1.6" . . "Biber 105" . . . . "12.038" .