I understand you are requesting a HTML game in which you start inside a submarine, have a choice between the Titanic and the Brittanic, hear water sounds, see a piece of the ship after 4 seconds, and then be able to click on a door to get out and see water and the ship you picked. Here's an example of how the game could be implemented:
Please note that this is a simplified example just to demonstrate the basic flow of the game. You would need to provide the necessary image and audio files, and enhance the game with more graphics, interactions, and functionality based on your specific requirements.