. "Hydra-class frigate" . "''Hydra'' class frigates" . . . "14.8" . . "Hydra-class frigate" . . . . "Hydra class" . "''Hydra''" . "117.5" . . . . . "57.412" . "''Hydra'' class" . "Hydra" . . "''Hydra''-class frigate" . .