The cruise operator was found to have been negligent in setting off on the cruise, which took place as COVID-19 was erupting around the world.
The class action accused Carnival, which chartered the ship, and the Ruby Princess’ owner-operator Princess Cruise Lines, of breaching duties of care and Australian consumer law.
Almost 700 people on board were infected with COVID-19.
In total, 28 died as a result of the virus.
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The ill-fated cruise left Sydney on March 8, 2020, for a trip around New Zealand.
However, it cut short the 13-night journey and returned to Australia on March 19 after COVID-19 cases were reported on board.
9news.com.au has contacted Carnival Australia for comment.