The Mysterious Island (1929)

On a volcanic island near the Kingdom of Hetvia rules Count Dakkar a benevolent leader and scientist who has eliminated class distinction among the islands inhabitants Dakkar his sister Sonia and her fiance engineer Nicolai Roget have designed a submarine which Roget pilots on its initial voyage just before the island is overrun by Baron Falon despotic ruler of Hetvia Falon sets out after Roget in a second submarine and the two craft diving to the oceans floor discover a strange land populated by dragons giant squid and an eerie undiscovered humanoid race