Shipping executives meeting in Athens have said that any peace deal worked out between the United States and Iran would need to offer clear rules allowing vessels to resume normal business via the Strait of Hormuz, Reuters reports.

Shipowners and maritime industry officials met at a Capital Link conference and other events to begin Posidonia, a week-long biennial shipping exhibition.

“Can somebody predict (the end of the conflict)? Unfortunately, no. It has been proven that there is no prediction, and things get messy in terms of conflicts very, very easily, and they get untangled very, very difficult,” Greece’s Shipping Minister Vasilis Kikilias said.