Search the depths of the sea for lost treasure in this charming underwater adventure. Take control of a yellow submarine equipped with a mechanical arm that can grab treasure off the sea floor. Explore an underwater labyrinth of caverns and caves littered with treasures but surrounded by deadly sea creatures. Fire missiles forward to attack creatures in front and launch missiles upward to fend off dangers from above. Keep an eye out for keys that can unlock doors to deeper caverns as you gradually make your way to the hidden chamber where the giant underwater boss awaits.