[succerpunch]

What must they fix, there is nothing wrong with the game. When you blow ballast you use all your compressed air to blast out the water in your ballast tanks and when your on the surface you need to fill your compressed air tanks with air because they are empty. There is no such thing as fill it up with just enough water to dive because once you let water in and your weight is greater then your displacement you will start to dive but if you compressed air tanks are empty you will continue to dive until you pass crush depth and implode. If you have air in your compressed air tanks then you can once you dive use the air to push some water out so that your weight is equal to your displacement so you can hover but if you don't have any air in your compressed air tanks you will continue to dive because you can't force the water out.