A diver descends into shark-infested waters armed only with a harpoon gun, tasked with eliminating the predatory creatures lurking in each submerged level. Standing on the ocean floor while your air supply dwindles, you must aim upward and strike down the shark circling above before your oxygen runs out and you forfeit one of your three lives. As you progress through the depths, the waters become more treacherous—eels, fish, and squid now patrol the same environments, creating obstacles that cannot be harpooned and must be dodged at all costs. Each level demands quick reflexes and precise timing to overcome the mounting dangers below the surface.