Fight for supremacy of the high seas!
As the pilot of the Subroc sea-to-air attack vehicle, you were hailed as a national hero after single-handidly repelling the enemy army which was trying to gain control of the commercial sea shipping lines. But this victory only served to strengthen the enemy's resolve, and now they are back with a vengeance! Luckily, you are now in command of the SubRoc Mark-II, which is fully submersible, making it a force to be reckoned with on the high seas.
Destroy enemy saucers, robotic boats and incoming missiles on the surface, then dive underwater to face enemy submarines and mines. Your government is counting on you!