The conflict of the film is the survivors of the battle between an Allied ship and a U-boat try to survive on a make shift lifeboat and get along long enough to make it to Bermuda or find a ship that belongs to the Allied. An example of this is the survivors having to rationalize the food and water long enough to last until they are found or make it to Bermuda.
3. The cause of the conflict was caused by the battle between an Allied ship and a U-boat both of which sank one another and caused several people from the ships to be stranded in the middle of the ocean and forced to coexist on a lifeboat together long enough to be saved. The conflict began at the beginning of the film due to the battle between the ships started around the beginning credits.
4. Most of the characters in the film are protagonist and in the sense that they are willing to do whatever it takes to survive such as rationalize their food and water amongst each including the antagonist Willi the German