That actually happened to some people that we were sailing with. It wasn't the ship holding the passports, it was left in their safe. They intentionally decided between the six of them to spend more time in Rome and take the train to Naples and catch the ship there the next day. Only one problem with their plan, weather prohibited us from being able to dock in Naples. So the ship headed on to its next port, which was Malta. Malta is not a EU country so they couldn't fly to Malta to catch the ship, they had to fly to Barcelona and wait 3 days for the ship to return to port so they could get their belongings off the ship