The entire article seems weird. They say "crew" but mean "property" - it's the ship that is trapped, the crew could be evacuated at any time, but as spoiled in one line:
"They're part of the ship. They are necessary to keep the ship staffed and operational," Adm Gilreath said. "They're the best responders on board the ship themselves."
And of course:
The crew, made up of 20 Indians and a Sri Lankan national, has been unable to disembark because of visa restrictions, a lack of required shore passes and parallel ongoing investigations by the National Transportation Safety Board (NTSB) and FBI.
So again, the reason the crew is stuck is that USA don't allow them offboard.