
Wikipedia
Rollo, a wealthy man, proposes to his neighbour Betsy, but she refuses. He
then decides to go alone on the honeymoon cruise, and because he does not want
to get up early, boards the ship the night before departure. He however boards
the wrong ship, that happens to just have been sold by Betsy's father to a
small country at war. Betsy's father boards the ship to get back some papers
that were left onboard, just as enemy agents of that country set the ship
adrift. The father is captured, and Betsy boards the ship when she hears him
cry for help just before it gets cut loose. Rollo and Betsy are then stranded
at sea and learn to survive with the food found in the kitchen. The ship
eventually grounds itself and springs a leak near an inhabited tropical
island. Using a diving suit found aboard, Rollo dives to repair the ship, but
Betsy is captured by the natives. Rollo scares them of when he emerges from
the ocean and brings Betsy back to the ship. The natives then attack and board
the ship, Rollo and Betsy fight them back with fireworks, then escape on a
dinghy that starts to sink. They are saved by a submarine that surfaces just
in the nick of time.