Atlantis Underwater Tycoon is a business simulation game in which you must create an underwater civilization, and become a tycoon. It was developed and published by Activision Value, and released January 3, 2003 for Microsoft Windows on the PC.
The player starts with a home base, and expands from there. As the city expands, a wider range of buildings and residents become available. When these new items are placed, they bring in more tourists and residents with money, and this unlocks new buildings.
As well as having to balance the economic aspects of the game, the player must contend with attacks from enemy submarines.