P&O's Pacific Adventure was supposed to stop at multiple ports in New Zealand.
But it was turned away due to invasive species on the hull, The Guardian reported.
The report said passengers were experiencing seasickness and were offered a refund and $200 onboard credit.
Passengers on a P&O cruise have been stuck on board and experiencing seasickness after the ship was turned away from New Zealand, The Guardian reported.
The cruise was supposed to stop at multiple ports in New Zealand after departing Sydney last Monday.
But the Pacific Adventure was prevented from docking in New Zealand, which has strict biosecurity laws, due to invasive species attached to its hull, The Guardian reported.
Divers were scheduled to remove three juvenile mussels and one Lace Coral, the report said, but diving conditions were worse than anticipated.
As a result, the report added, passengers had been left at sea for longer than expected. One passenger, Jake Welch, told The Guardian: "The sick bags are quickly disappearing from the stairwells."
The newspaper reported that the cruise had been rescheduled to stop at only three ports in Australia.
"My wife and I are on this crummy cruise to nowhere, very disappointing, never travelling on P&O again," The Guardian quoted one passenger saying on a Facebook page created for the cruise.
Welch told The Guardian that P&O initially offered a 50% "future cruise credit" plan to passengers, which prompted an outcry.
The report said the operator was now offering passengers a refund and 300 Australian dollars, or about $200, of onboard credit.
"We have listened to the feedback from our guests and understand not all of them wish to cruise with us again," a P&O spokesperson told the newspaper.
"Again, we apologise for the change in itinerary, and thank our guests for their patience and understanding."
P&O Australia did not immediately respond to a request for comment from Business Insider, sent outside local working hours.
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