INFO ? Alien Colony Expansion
Aliens will construct secret undersea colonies in remote locations. After some initial reconnaissance flights some intense Alien Sub activity will occur as the colony is being built. These colonies are known to contain labs, cloning centres, surgical facilities for human and Alien experimentation. The presence of Alien colonies will generate more Alien activity without the presence of Alien Subs. In order to locate a colony an X-Com sub must patrol an area for a few hours to stand some chance of successful detection.
INFO ? Alien Colony Expansion