The recent Suez blockage has again focused the attention on the risks associated with ultra large container vessels (ULCVs). Social media raise the question whether these mega-ships have become too big to sail. The International Transport Forum (ITF) already pointed to the risks of the ULCVs with its report on the impact of mega-ship published in 2015. But policy makers took its recommendations for granted, impressed about the length of the vessels and the number of containers they carry, bringing economies of scale in the age of globalisation. Others thought that an incident was just waiting to happen as the ships continued to get bigger and bigger. There is no doubt that bigger ships create bigger problems, in case of accidents, environmental damages and wider impacts on the supply chain.