Combat in the South China Sea requires different tactics than the deep Atlantic:

A major economic crisis leads China to move into territory such as the Spratly Islands, Taiwan, and Hong Kong.

Many areas are very shallow (described as "playing in a bathtub"), making it difficult to hide in deep thermal layers.

Players predominantly face the People's Liberation Army Navy (PLAN), which is sometimes supported by Russian submarines and advisors.

If you are looking at this as a manual modification (RAR file): South China Sea - Cold Waters - First Look

The game uses a point system; completing mission objectives carries significantly more strategic weight than simply sinking random patrols. Installation & Customization

The file Cold.Waters.South.China.Sea.rar typically refers to the for the submarine simulator Cold Waters . This campaign is officially set in the year 2000 and depicts a hypothetical naval conflict between the United States and China. Campaign Overview