Not as simple a situation as it sounds, I believe they being evacuated to cruise ships. Cruise ships are notorious for the rapid spread of viruses if there's cases on board.
Even if there is a case on board covid still has 99.7% survival rate. Im sure the cruise ship could easily have a section for non vac people. If not, get another ship ffs. You cant leave people behind to suffer and die for no vac, thats disgusting. Its the other countries that wont let them enter without a vac that are the ones to blame aswell.