The Yagán Flood.
This legend tells about how long ago the moon fell into the sea, making it rise, as the water in a bucket rises, when a great stone falls inside.
The only survivors of the flood were the lucky inhabitants of Gable island (in front of Port Williams in the Beagle channel), which broke off from its bed in the ocean and floated freely in the sea.
Soon to the surrounding mountains were covered with water and the people of Gable island saw nothing but water on the horizon.
The island did not go drift, it must have anchored somehow and when the moon eventually appeared it emerged with its load of human beings, guanacos and foxes, populating the world once again.