The Quantum of the Seas cruise ship is docked at the Marina Bay Cruise Center Wednesday, Dec. 9, 2020 in Singapore. Danial Hakim/AP hide caption
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Royal Caribbean's Symphony of the Seas cruise ship, seen docked in Miami in March 2020, saw 48 cases of COVID-19 on its most recent seven-day sailing. Joe Raedle/Getty Images hide caption
Royal Caribbean said that a guest on the Quantum of the Seas, shown here Wednesday in Singapore, tested positive for coronavirus after checking in with its medical team. The ship returned to port in accordance with government protocols. Danial Hakim/AP hide caption
After bad weather forced it to reroute, the Royal Caribbean cruise ship Empress of the Seas rescued two stranded fishermen last week between Grand Cayman and Jamaica. Lynne Sladky/AP hide caption
Mexican police officers stand guard near the tour bus that overturned Tuesday morning in Quintana Roo state. Twelve people were killed, including 8 Americans. Maneul Jesus Ortega Canche/AFP/Getty Images hide caption
Police and paramedics at the scene of a tourist bus crash in eastern Mexico Tuesday. Most of the passengers on board were had arrived aboard cruise ships and were going to view Mayan ruins. Manuel Jesus Ortega Canche/AFP/Getty Images hide caption
In this Sept. 11 photo provided by Emily Morgan, Chase Morgan holds his son Haiden's hand at the Miami Children's Hospital. Emily Morgan, who unexpectedly gave birth on a cruise ship months before her due date, says she wrapped towels around her boy and, with the help of medical staff, managed to keep him alive until the ship reached port. Emily Morgan/AP hide caption