Black Mesa Incident
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 Black Mesa Incident captured by an unknown photographer, released on December 9, 2000. | |
| Date | December 6–7, 2000 |
|---|---|
| Duration | 36 hours, 32 minutes and 37 seconds |
| Location | Black Mesa Research Facility, New Mexico, United States |
| Cause | Anti-Mass Spectrometer accident involving a resonance cascade |
| Casualties | |
| 2,237 | |