Emergency services said more than 100 people had to be rescued from floodwaters as efforts continued in rough seas off the coast of Sydney to prevent a stricken cargo ship from crashing into rocks. By early evening, at least three tugboats were trying to hold the 570-foot-long Portland Bay after efforts to rescue the boat’s 21 crew by helicopter were thwarted amid 16-foot waves and 55 mph wind gusts. Tugs were trying to tow the Portland Bay cargo ship out of harm’s way after it drifted onto rocks in stormy seas and strong winds off Sydney SEAN FOSTER/GETTY IMAGES The 17,000-tonne ship lost power south of Sydney early today and nearly ran aground on rocks south of the city before the crew managed to drop three anchors.