. . "Soviet submarine K-21" . . . "1937-12-10" . "''K-21''" . "1939-08-16" . "4.51" . . "Soviet submarine K-21" . . . . . "Soviet submarine ''K-21''" . . "97.65" . . . . "Museum shipin Murmansk since 1982." . . "Submarine ''K-21''" . . "K-class submarine, ''K-21''" . "1940-11-30" . "K-21" . "7.4" . .