What kind of accident is about to happen?

A wire is attached to the hook of a drag shovel with a crane attachment, and is being used to move a steel arch support at a tunnel construction site. Can you predict what's about to happen?

Look what happened!

The shovel operator stopped the shovel suddenly since a worker walked under the overhead load. As a result, the wire rope came off of the hook and the support beam fell on the worker.

Tips for preventing similar accidents
1.	Never let a worker walk under overhead loads.
2.	Be sure to inspect the safety catch for the hook before starting work.
3.	Assign someone to serve as a signaler and perform work in accordance with that person's instructions.
4.	Know the proper methods of hanging support beams, and the order in which beams are to be installed.

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