Cruise line says only vaccinated passengers can sail Given all the problems faced by the cruise industry in 2020, the announcement by one operator that all passengers must be fully vaccinated for Covid-19 before they board sounds sensible. But when Saga Cruises this week became the first to introduce the requirement, not everyone agreed — the British operator was inundated with so many responses, good and bad, it temporarily made its Twitter account private while it dealt with them. Nevertheless, the move by Saga will be eagerly watched by many in the cruise industry interested to see if whether a vaccine rule will help kick start travel, or prove as divisive as other attempts to work around Covid.