The potential tragedy happened in Shady Side, Maryland, south of Annapolis.
The trip was arranged by JusCollege, which reassured students they would be safe on the trip despite the coronavirus pandemic.
Some dial their state offices hundreds of times while others are met with frozen websites.
The updated guidelines say that an asymptomatic patient does not need to have a negative coronavirus test. They will be isolated and tested on the ship.
"My family and I are truly sorry to those we have offended for not appearing to be taking this crisis gravely seriously, and we are committed to making informed, responsible decisions moving forward," Charnas said.