To contaminate, the Queen must fly to the surface of the human’s planet and invade the building. The planet must be defenseless, ie without fleet and defense. If danger is discovered while approaching the planet, the Queen will be forced to join the battle and can infect the target if victorious. While infecting mines or refineries, a percentage of resources (depending on the evolution of contamination)) produced there become infected and are stored within the Queens belly sacs. While contaminating a mine or refinery, the Queen swells and can store 10 times her capacity. She can be recalled to her home planet at any time or will return on her own when she is full. While infecting a lab, a number of scientists will work for your benefit to reveal new research.