The IMO is again calling for member states to give seafarers "key worker" status that would help facilitate crew changes.

This time, the agency joined the United Nations Conference on Trade and Development (UNCTD) on Tuesday in issuing a joint statement urging the world to keep ships moving, ports open and trade flowing.

Part of that, the two said, was helping to change over the estimated 300,000 seafarers that will need to be replaced in the coming weeks, with roughly half flying home.