From gCaptain: Quick, Heavy Rolling Led to Loss of Containers from YM Efficiency Off Australia, ATSB Finds
By this time, the ship was on a heading of about 210° with a speed of about 4.3 knots. The weather at midnight was recorded as being overcast with west-south-westerly winds at force nine (between 41 and 47 knots) with 6 m seas and 5 m swells.”
The heavy rolling caused the ships main engine to shut down once again and, by about 0036, the rolling had reduced and the ship’s motion had calmed.