Overview
Mysterious Island is a USSR film adaptation of the 1874 novel The Mysterious Island by Jules Verne.
Plot summary
During the siege of Richmond, Virginia, in the American Civil War, five northern prisoners of war decide to escape in a rather unusual way – by hijacking a balloon.
The group eventually crash-lands on a cliff-bound, volcanic, unknown (and fictitious) island, located in the South Pacific. They name it "Lincoln Island" in honour of American President Abraham Lincoln. With the knowledge of the brilliant engineer, the five are able to sustain themselves on the island, producing fire, pottery, bricks, nitroglycerine, iron, a simple electric telegraph, and even a seaworthy ship. They also manage to find their geographical location.
The mystery of the island seems to come from periodic and inexplicable deus ex machinas: the unexplainable survival of Smith from his fall from the balloon, a box full of equipment (guns and ammunition, tools, etc.), and so on.
From Wikipedia (CC BY-SA 4.0).