Just like UFO: Enemy Unknown, the game consists of two parts.

This is also used as a plot device all of the alien technology from the first game is unusable in salt water, forcing the player to capture and develop new technology.

Terror from the Deep takes place mostly underwater, with base-building and combat all being submerged beneath the waves. Destruction of T'Leth by the player results in victory but also accidentally results in another worldwide environmental cataclysm, destroying the ecosystem of Earth and setting the stage for the third game in the series, X-COM: Apocalypse. Eventually, it is revealed the aquatic aliens came to Earth on a massive spacecraft, known as T'Leth, that crashed into what is now the Gulf of Mexico 65 million years ago, causing the extinction of the dinosaurs. The game is set in 2040, decades after the first Alien War was won, when a new alien menace begins to emerge from the oceans. It is the sequel to UFO: Enemy Unknown (aka X-COM: UFO Defense) and the second game of the X-COM series. X-COM: Terror from the Deep is a strategy video game developed and published by MicroProse in 1995 for the PC, with ports for the 3DO Interactive Multiplayer and Sony PlayStation in 1996. Stephen Goss, Julian Gollop, Nick Gollop, Bill Barna, Annette Bell, Nick Thompson Unfortunately, this game is currently available only in this version. If you think that the game in your browser does not behave as it should, try to choose another online emulator from this table. For fullscreen press 'Right Alt' + 'Enter'. Your combat now extends to the strange new worlds of the deep where superior alien technologies threaten the very survival of this planet - your planet - Earth.Game is controlled by the same keys that are used to playing under MS DOS. Slowly but surely, an army of hibernating alien sea creatures awakens. In the dark depths of vast oceans, long sleeping forces are awakened by reanimation signals sent out across the galactic silence by their interstellar brothers and sisters. Seeking to take advantage of a weakened Earth, X-COM's deep space foes unexpectedly change strategy and launch a powerful second front against planet Earth. X-COM: Terror from the Deep brings the alien terror into a totally new dimension. X-COM: UFO Defense brought you to a galactic battlefield.

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