The 879-foot-long cargo ship Efficiency rolled 30 degrees to port and starboard for 90 seconds in gale-force winds off the coast of Australia before 81 containers washed overboard in the middle of the night, according to a new report from the Australian Transport Safety Bureau. The Liberian-flagged Efficiency was en route from Taiwan to Port Botany, just below Sydney. It was delayed from docking for eight hours, according to the new report, while the crew stopped and restarted the main engine for brief periods of time to control the drift. At this point, the ship was 16 nm off Newcastle, which is…