Atlantis Underwater Tycoon

Atlantis Underwater Tycoon is an underwater city-building simulation game in which the player acts as a tycoon to simulate the real-time design and management of an underwater civilization. It was developed and published by Activision Value, and released on March 21, 2003 for Microsoft Windows on the PC. Atlantis Underwater Tycoon was the first building sim to be set underwater.