"This is a serious thing," said the doctor to me.' The island is still in the grip of that wretched current flowing southward. We will have to look into this tomorrow. If nothing can be done about it, the Indians had better take to canoes and leave the island. The chance of being wrecked will be better than getting frozen to death in the ice-floes of the Antarctick."
This is from a novel "The Voyages Of Doctor Dolittle". I couldn't understand the meaning of this phrase "The chance of being wrecked". What does this phrase mean?