When the sea levels rose 10 000 years ago, many spirits were trapped under the sea. The only way these spirits can return to the land is through the whales. It is said that whenever a whale calf is born, one of these spirits attaches itself to the whale calf. After 80 or 90 years swimming around the ocean, Mamong returns to this coast. Mamong the whale beaches itself to return the spirit being carried by the whale back into the land where it belongs.
The Nyungar men knew when the whales were coming and would prepare a ceremonial knife called a Daap. When the whale washed ashore, the Daap was used to cut open the whale and when the blood from the whale ran into the land, the people would be satisfied that the spirit had returned.2