In Archimedean Dynasty, you play as the mercenary Emerald "Deadeye" Flint. During the missions, which range from simple escorts over search-and-destroy to attack raids on huge submarines, you control a small one-manned submarine. Between missions you are able to buy upgrades for your ship (e.g. better guns, bigger torpedoes, better armor), while proceeding through the storyline and discovering more of the fascinating underwater world of Aqua.