Okay - let's say they get these cruise ships in NO. How are these people going to get to them???
They're calling for everyone who has a boat to volunteer. Anything that floats could do it, plus the cruise ships have small boats that they could launch.
Each cruise ship has several small craft usually used in ferrying vacationing passangers to Island stops. They can do the same here. Also, vessels FEMA is using or other small craft appropriated locally could do the same.