Atragon

Atragon (海底軍艦, Kaitei Gunkan; lit. 'The Undersea Warship') is a 1963 Japanese epic science fiction film directed by Ishirō Honda, with special effects by Eiji Tsuburaya. Produced and distributed by Toho, it is based on The Undersea Warship: A Fantastic Tale of Island Adventure by Shunrō Oshikawa and The Undersea Kingdom by Shigeru Komatsuzaki.