Approx. 11 AM on 3/20/2014, a DuPont emp. was descending steps on the MX. dredge, lost their footing & slipped down the steps. The emp.'s left elbow hit the steps during the fall. The EE began to lose consciousness when they stood up. A nearby emp. assisted the EE to the deck. The EE was transported to site medical for treatment. Injury classification is ER-MTC.