ABC 7 News reveals that a cellphone user took a dramatic video of a construction site accident in San Jose, California, and that this video was sent anonymously to Santa Clara county officials in an effort to expose work site dangers. The video shows an explosion occurring at San Jose's Santa Clara Valley Medical Center that injured a worker. The explosion occurred a little over a year ago when the general contractor and a subcontractor were adding a new section of steam pipe to provide heating to one of the new hospital buildings. A worker for the subcontractor was climbing out of an underground vault as the steam pipe exploded. Fortunately, co-workers were able to rapidly pull the worker out of the vault, saving him from suffering serious injuries and burns.