Pair 'Fall Off' Cruise Liner In Australia Authorities are searching the sea off Australia's east coast for two cruise passengers who were discovered missing when their ship docked in Sydney Harbour at the end of a 10-day journey. A 30-year-old man and 27-year-old woman were discovered missing after the Carnival Spirit docked at Sydney's Circular Quay on Thursday morning, New South Wales state Police Superintendent Mark Hutchings said. He said onboard CCTV footage indicated the pair had fallen overboard. "We believe they have gone overboard," he told reporters, adding there was "a chance" that they might be alive. Police officers check for fingerprints on the balcony of the couple's cabin "This is a tragic event at the moment, but we're holding out hope we might be able to find these people alive," he said. The missing passengers are a couple from New South Wales who are believed to have fallen from the ship's middle deck on Wednesday night, Supt Hutchings said. He did not reveal the circumstances of their fall. It was discovered the pair were missing during the debarkation process, said Peter Taylor, a spokesman for the ship's operator, Carnival Cruise Lines. The guests in question were travelling with family and friends. Initial reports indicate that the couple was last seen onboard the vessel last night (Wednesday)," Mr Taylor said in a statement. "The ship immediately initiated standard missing person procedures, including a full search of the vessel, as per protocol," he said. Jo Meehan, a spokeswoman for the Australian Maritime Safety Authority, which is coordinating the search, said an air and sea search of a 1,000-square-kilometre area of ocean north of Sydney was under way. Carnival Cruise Lines is a subsidiary of Miami-based Carnival Corp, the world's largest cruise operator. The Costa Concordia was operated by Canival Corp Carnival has been plagued by a series of high-profile problems in recent years. Last year, the Costa Concordia ran aground off the coast of Italy, killing 32 people. Also last year, the Costa Allegra caught fire and lost power in the Indian Ocean, leaving passengers without working toilets, running water or air conditioning for three days. Costa is a division of Carnival Corp. In February, passengers aboard the Carnival Triumph spent five days without power in the Gulf of Mexico after an engine-room fire disabled the vessel. Those on board complained of squalid conditions, including overflowing toilets and food shortages. Related Stories