Rosenberg elects to stay behind to meet with the military on arrival and Cross and Green return to Keller. However, the military are ordered not only to contain the situation, but to silence the base by killing its employees. Cross and Green escort Rosenberg to the surface, where he sends a distress signal to the military. Keller and Rosenberg agree that Black Mesa cannot deal with the situation on its own, and so decide to call for military assistance. When Freeman inserts the specimen into the scanning beam, however, it triggers a 'resonance cascade', causing massive damage to the facility and teleporting alien creatures into the base. Rosenberg to pushing the analysis equipment beyond its design capacities, Cross and Green are assigned to assist setting up the experiment for Gordon Freeman. Keller, who is readying the day's analysis of an unknown specimen. Gina Cross and Colette Green arriving at the Anomalous Materials Labs at Black Mesa and reporting to Dr.
