The website for Black Mesa Source, a Half-Life recreation, is currently broadcasting an emergency signal to anyone who visits. It reads the following message to users:
The following message is transmitted at the request of local authorities. At 9:47 AM, Mountain Time, a disaster of unknown type has occurred at the Black Mesa Research Facility causing significant damage and failure to various power and communication systems in the surrounding areas. An immediate evacuation order has been issued for all residents within a 75 mile radius of the facility, and on-site military has been dispatched to provide assistance. Make sure to bring an emergency supply of food, water, clothing, first aid kit, flashlights with extra batteries, and battery powered radios. Follow local evacuation routes which have been marked by local authorities and only use one vehicle. Do not return to the warning area until the all clear has been given. If you are not in the evacuation zone stay where you are. If you are within the evacuation area and have no transportation locate your nearest police department or military officer. Do not use telephones or cell phones except in the case of emergencies. Stay tuned to local news media outlets for further details and information on this situation.
Many gamers are speculating that this is the prelude to an announcement of Black Mesa Source seeing a full game release on Steam.This would be pretty monumental, as most mods do not become accepted as 'real' games. There are a few others that have made the jump, such as DayZ, but it can be a tough task.
While the full Steam release seems like the best theory, this could mean a number of things, so let the guesswork begin.