The Mysterious Island (1929, dir. Lucien Hubbard) (via), which was loosely based on Jules Verne’s 1874 novel of the same name.
In the film, ocean explorers discover an underwater city populated by a race of aquatic creatures.

The Mysterious Island (1929, dir. Lucien Hubbard) (via), which was loosely based on Jules Verne’s 1874 novel of the same name.

In the film, ocean explorers discover an underwater city populated by a race of aquatic creatures.