The players are building a research station at the bottom of the sea, trying to find Atlantis, recover sunken treasures, and extract raw materials. The board shows the sea floor as a grid with shades indicating the levels of depth. Before the game, each player receives a card with a special assignment, a listing of the specific number and type of units he should build and which treasures to seek. The three game phases include: (1) expanding the station, (2) deploying scientists, and (3) exploration (via miniature submarine).