Abstract: At approximately 10:00 a.m. on March 19, 1997, Employee #1, an experienced grip for Warner Brothers, was working on a feature film titled "Sphere." He was on location over a large tank that was being used as an underwater motion picture set. Employee #1 was raising a block and tackle with a tag line but problems with the rigging caused the tag line to jam in the block. The tag line suddenly came loose, causing him to fall backward and under the top rail. He fell more than 40 ft into the partially filled tank, striking a corner brace on the northwest inside corner of the tank and sustaining severe leg injuries. Employee #1 was standing on a suspended scaffold that was not equipped with midrails.