New Clues on How Hundreds of Passengers Were Sickened on a Royal Caribbean Cruise Ship

Fast-moving virus caused ship to end the cruise two days early.
3:00 | 01/28/14

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Transcript for New Clues on How Hundreds of Passengers Were Sickened on a Royal Caribbean Cruise Ship
Last night, we told you about the mystery onboard the cruise ship. Hundreds of passengers sickened by a lightning-fast virus. Tonight, new clues on how it spread and what the company has offered all those companies. Their vacation ruined. Here's ABC's linsey Davis. Reporter: Onboard the royal caribbean "Explorer of the sea," anger is spreading as fast as illness. One woman onboard sent us this picture with the caption, feel like we're in a bubble. And sad thing is, they aren't even doing the right thing for us. We didn't go to half our ports. There were almost -- nothing to do on the ship, the days that people were sick. Reporter: Royal caribbean has apologized they were unable to deliver the vacation our guests were expecting. They're offering a 50% refund for this cruise and 50% off the cost of a future cruise. Basically, we had two good days out of ten we were promised. Reporter: They want their money back. But experts say, it's unlikely. Is this rare for people to actually receive full compensation? The cruise lines don't have to compensate you at all. When they decide to compensate passengers, it's, so to speak, out of the goodness of their hearts. Reporter: The stomach bug believed to be the norovirus is highly contagious. Each infected person generally passes it along to as many as three other people. And so on and so on. Leading to as many as 100 cases by the third day of an outbreak. On this cruise, the first case was reported last Tuesday. By Sunday, the number of people infected had reached 303. 24 hours later, that number more than doubled, with 626 people reported ill. Today, that number shot up to 672 people. For the thousands on that ship, it's a vacation that simply can't end soon enough. Linsey Davis, ABC news, New York.

This transcript has been automatically generated and may not be 100% accurate.

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