In case of huricanne, one of the ships will come an evacuate them.
I beleive that they are on 6 month contracts too.
They try to get as much work done by dusk because of the bug problem.
There are about 30 of them that stay on the island. The few Bahamians that have shops on the island (near the tram to Serenety Bay) come over in the morning by boat.
Don't know what happens if there is a medical emergency.