The IMO protocol for the safe release of ship crews is available at the following link:
http://www.imo.org/en/MediaCentre/HotTopics/Documents/COVID%20CL%204204%20adds/Circular%20Letter%20No.4204-Add.14%20-%20Coronavirus%20(Covid-19)%20-%20Recommended%20Framework%20Of%20Protocols.pdf
