Deep Sea Underwater is the newest full game. You command a submarine underwater.....your goal is to avoid as many obstacles in the form of stalagmites, stalactites and mines in the sea. Clicking the left mouse button briefly keeps your sub afloat, releasing it makes it sink. Along the way treasure chest will pop up. Collect them for a big score, but that feat is not as easy as you may think.
At the moment there is a Linux version. There will be a Windows and Mobile version later. I am also thinking about doing a Mac version but that is another matter altogether.