There was a movie that started with a drifting bottle. The story was about a submarine crossing into another world during World War II

Answer 1

This was the setting of a novel. The following are possible scenarios:

During World War II, a submarine accidentally discovered a drifting bottle during a mission and picked it up. The crew on the submarine discovered a mysterious world while deciphering the bottle. This world was vastly different from the real world, including the flow of time, the level of technology, and so on.

In this world, the submarine crew is invited to participate in a mysterious activity that can help them return to the real world, but they must face a series of dangers and challenges. During the event, they might encounter other crew members or mysterious enemies. They must survive in this mysterious world and return to the real world to complete the mission.