Cranes with a greater height and outreach are often seen as a necessity to accommodate the latest and future generations of containerships. Indeed, the largest container vessels typically have a depth from deck to keel of 25 metres, with some new tonnage reaching 27 metres. When calling at a port not fully loaded, such vessels can come in 5.5 metres above the Plimsoll line. What's more, the 9'6" high-cube container is becoming predominant compared to the traditional 8'6" high unit.