They use it to find out that an atomic power plant due to be opened near where they are in Quebec is in the hands of the aliens. Later it is revealed that it is to go critical and will spread deadly radiation over many hundreds of miles (the aliens are immune to radiation).
The characters learn that a nuclear power plant planned for construction near their location in Quebec is controlled by aliens.  It's discovered that the plant will malfunction, releasing harmful radiation over a wide area, but the aliens are unaffected by it.