Two deployed in the North Sea cruiseferries have been put up for sale weeks after the UK-Belgium route was closed.
Both Ro-Pax vessels (each with max capacity 1250 passengers and 850 cars) were listed on a German shipbrokers website.
The UK's Department for Transport said the operation of ferry routes was a commercial matter for the relevant companies concerned and added that throughout the Coronavirus/COVID crisis the government had invested millions to protect the critical passenger and cargo routes.
Both ferries are sisterships (1987-built/34-years-old), with LOA length 179 m (588 ft) and were among the largest in the UK.
The route Hull-Zeebrugge had been running since the 1960s. However, it was described as loss-making by P&O Ferries and saw its last crossing on January 1, 2021.