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A spokesperson for Amsa said it was first alerted to the missing woman at around 21:00 local time (10:00 GMT) on Saturday by the ship's captain. A search party returned to the island a few hours later but efforts to find Suzanne were called off in the early hours of Sunday before a helicopter returned in the morning and found her body. On Wednesday, the chief executive of Coral Expeditions said the company was "deeply sorry" for the death and were offering their support to the Rees family. "We are working closely with Queensland Police and other authorities to support their investigation. We are unable to comment further while this process is under way," Mark Fifield said. The Coral Adventurer caters for up to 120 guests with 46 crew, according to the company's website. It was purpose-built to access remote areas of Australia's coast and is equipped with "tenders" - small boats used to take passengers on day excursions. Incidents like this are rare, and cruise ships have systems to record which passengers are embarking or disembarking, Harriet Mallinson, cruise editor of travel website Sailawaze told the BBC. "Sneaking ashore or [back] onboard just isn't an option," she said. Cruise lines take these procedures very seriously and have "clever tech in place to prevent such incidents from happening. This is most likely a shocking - and tragic - one-off," Ms Mallinson added.