Descpription:
Under a starry sky, player must use the submarine to
fight off enemy helicopters using missiles and rockets. Player controls
submarine in eight directions to evade enemy attacks. 30 helicopters in groups
of 10 and 4 high-speed versions of them attack from different altitudes.
Depth charges released by helicopters into the sea explode at determined
underwater depth. If helicopters are not destroyed within the time
limit, the helicopters will attack in a special assault pattern.
If the players destroy a required number of helicopters, the
submarine surfaces, while a native girl dancing on an island boards
the submarine, which gives players extra points. The ocean floor
rises each time the required number of helicopters are destroyed.
