Employees were attempting to move a crate of six granite slabs (weighing approximately 800 pounds each) from the back of a trailer using a chain. One end of the chain was tied to the mast of a forklift and the other wrapped around the bottom of the crate. Before they pulled the crate from the trailer, a strap that was holding the slabs broke, allowing the slabs to fall onto the injured employee, who broke both legs.