ROME — As shaken survivors spoke of a mad crush to flee a sinking cruise ship off the Tuscan coast of Italy on Saturday, raising questions about the crew’s preparedness, Italian authorities arrested the ship’s captain amid concerns that the megaship had steered dangerously off course.

At least three people were killed in the accident, and divers combed the ship’s underwater cabins all day for those still missing, up to 60 people. Early Sunday, rescuers found two survivors still inside the ship, raising hopes that others might still be alive.

The Costa Concordia, carrying 4,200 passengers and crew on a weeklong Mediterranean cruise, slammed into an undetermined object near the island of Giglio on Friday night as passengers for the late seating had just started dinner, tucking into appetizers of grilled mushrooms and scallops.

“In a moment, everything was up in the air,” said Alessandra Grasso, 24, a passenger from Sicily. “People, chairs, glasses, food.”