Some on board the ship say the situation is dire and passengers have been confined to their state rooms for weeks. Maximilian Jo’s parents, Jae, 76, and Julitta, 75, are both on board the Zaandam.

Meanwhile, at least 77 people – 30 guests and 47 crew members – aboard Holland America’s Zaandam ship have reported experiencing flu-like symptoms, the cruise line said in a statement.

The Zaandam first departed from Buenos Aires, Argentina, on March 7, one day before the U.S. State Department advised to avoid cruise travel, and one week before most cruise lines temporarily ...