U.S. Department of Labor
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Got plans for what you're going to do at the end of this shift?
So did these people.
Two workers were given new jobs. One of them was briefly shown how to operate a crane and the other was assigned to help by rigging loads. The worker given the crane assignment spent a short period of time practicing. As the crane extended, the headache ball was pulled tightly against the crane by its cable. Since the alarms had been disconnected, there was no warning before the two-blocked boom broke free and dropped directly onto the worker below. He died.
Expect the unexpected. Play by the rules.