Click on the photo to learn more about the 2013 incident at Felixstowe Dockworkers
Maersk Line is upgrading its eight E-class 15,550 teu vessels to load a further 1,300 teu.
Raising the accommodation block and wheelhouse and increasing the height of lashing bridges to take an extra tier of containers is likely to double the lifetime of the 10-year-old ships, and could be viewed as a statement from Maersk on maximum vessel size strategy.
Remedial work was needed on the Odense-built ships after the Emma Maersk was fortunate not to sink at the northern entrance to the Suez Canal in early 2013 after the hull was fractured by a failed stern thruster.
After the incident, Maersk prohibited the use of stern thrusters on its Emma-class ships until modifications could be made to the fleet.