The job duties of an offshore rigger are to monitor, inspect, move, or operate heavy equipment and machinery on an oil rig. One offshore rigger may set up and monitor drill activities and move heavy equipment related to drilling and extraction. Another may inspect and maintain equipment to ensure safe operations. A marine rigger, who also works at sea, handles the rigging responsibilities on a ship. Other positions for an offshore rigger focus on laying cable on the ocean floor or performing maintenance on an existing oil rig.