Puts the player in command of a submarine that must sink surface ships while dodging mines and enemy torpedoes underwater, alternating fire upward and downward depending on the threat of the moment. It's one of the naval-combat variants the console's catalog tried during the first half of its life.
It didn't reach the popularity of other 2600 shooters, but its underwater setting and the need to manage two simultaneous firing fronts set it apart within the offerings of the era.
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