The Mysterious Island

Dakkar

Sonia (as Jane Daly)

Nikolai

Falon

Mikhail

Anton

Dmitry

Teresa

(uncredited)

Workman (uncredited)

Underwater Creature (uncredited)

(uncredited)

(uncredited)

(uncredited)

Workman (uncredited)

Film historians long believed no complete print of the film had survived - until 2013 when experts in the US discovered that the movie had been preserved in the Czech National Archive.

According to an article in the original "Famous Monsters of Filmland" magazines, production was actually started in 1926. There were various problems, including weather and the advent of talkies, which slowed/halted production several times before the film was finally completed and released three years later. The article included stills showing the original 1926 undersea denizens and the redesigned version which actually appeared in the film.

Footage shot by Maurice Tourneur and Benjamin Christensen in 1927 was incorporated into the movie.

The initial views of the ship's nose during construction shows a blunt rounded appearance as with modern submarines, but the animation views of the ship underway show an almost cartoon-like shape with a swordfish-like pointy nose.

During the initial test run of the ship, one brief scene shows it upside down.