Dive into deeps and try to get as far as possible. Collect oxygen bombs and health to extend your underwater stay or end immediately if you make mistake.
The diver is controlled by leaning the whole device so you can look around for oxygen, health and money. The breathing thing keeps you long enough alive but the health can be lost when contacting medusas, fish and mines. The money is the motivation system. Buy various things and upgrades. However, the beginning is rather slow.