After losing contact with Earth, Astronaut Lee Miller becomes stranded in orbit alone aboard the International Space Station. As time passes and life support systems dwindle, Lee battles to maintain his sanity - and simply stay alive. His world is a claustrophobic and lonely existence, until he makes a strange discovery aboard the ship.

Murphy is the sole survivor of his crew, that has been massacred by a German U-Boat in the closing days of World War II. He lands on the shore somewhere on the river Orinoco delta and begins to plot his vengeance. He wishes to sink the U-Boat that has floated up by means of any method imaginable to him, and sets about to make the courageous attempt, assisted by Louie, the islands Government Administrator.

A British Sub goes missing at the end of the war leaving only one crew member surviving. Everyone believes it lost to the bottom of the Baltic Sea, then 40 years later it reappears without a crew. The British government send for the the surviving crew member (David Jason) now a marine biologist. With a new crew and Jason then proceed to trace the last know happenings on the sub. But this submarine has a life of its own and the new crew soon start showing characteristics of the old crew.