Submarine Titans is a real-time strategy video game that takes place in the year 2115 after a comet has struck Earth, driving two human factions, the militant White Sharks and the scientific Black Octopi, to establish underwater bases and fight for dominance over the oceans. The comet also brought a mysterious alien race known as the Silicons, who compete with the two human factions to collect resources and build a gate that would take them back to their homeworld. Each faction has its own ten-mission campaign, and the player can play the three campaigns in any order.
With the exception of their technology trees, the human factions share many similarities and are functionally identical. However, the Silicons use a different resource model. The White Sharks and Black Octopi require a supply of oxygen to power all their structures and must harvest metal and a special element called Corium to build submarines and facilities, while the Silicons must extract silicon from the sea floor to produce their basic resource and use metal to generate energy and power their regeneration ability. Nevertheless, they harvest Corium in the same way as the human factions do.
Because the game takes place underwater, units can be moved up or down in relation to the sea floor, in addition to their movement in a two-dimensional direction. The terrain of the map, which can have hills, mountains and land bridges, affect how a base can be constructed and the movement of the player's units. The game includes a level editor, allowing players to create their own maps. It is also the first real-time strategy game to feature a spectator mode, which allows players to watch multiplayer matches without intervening in the gameplay.
Source: Wikipedia, "[en.wikipedia.org/wiki/Submarine_TITANS Submarine TITANS]", available under the CC-BY-SA License.