Alien encyclopedia features mutation technology and new watery denizens.Multilevel tactical maps featuring both underseascapes and buildings.Rich graphics feature water coloration and wrecks.Full array of undersea military technology.Actual undersea geoscape mapping system with rich topographic detail.Sequel to the hugely successful X-COM: UFO Defense.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. 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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