Efforts to dislodge the huge container ship stuck in the Suez Canal intensified Saturday as the backlog of ships at either end of the crucial waterway grew, heightening concerns over the impact of the blockage on global supply chains.Efforts to dislodge the huge container ship stuck in the Suez Canal intensified Saturday as the backlog of ships at either end of the crucial waterway grew, heightening concerns over the impact of the blockage on global supply chains.