What to do with the numerous floating infections that were major cruise liners? Sinking them with torpedos too drastic a measure? How about docking them on man-made islands in the middle of a sea and letting them quietly sit until they can be cleaned out or dismantled.
Remove the crews ashore to await the gradual decline of the viral infection. House them with people who know what to do. Keep them on those islands or send them ashore to the nearest port.
Sail the ships to the newly-raised sand islands in the South China Sea and let the Chinese naval authorities mind them until the pandemic has finally been conquered. After all, China has been telling the world how well it has coped with the situation…Now they can demonstrate their prowess.