|Description||Stealthy Fast-Moving Naval Vessel|
|Limit||1 Submarine per Limit::15 battleships|
A submarine is just like any other naval vessel -- except in the fact that it is submersible. Submarines can travel undetected underwater, and thus are highly mobile and deadly. They are an all around good unit, equally good at defending as well as attacking.
A nation must first research SONAR to be able to purchase submarines.