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Geoff Hunter, 62, had “no choice but to swim” for up to three chilling hours after an unclipped safety harness landed him in the drink.
Mr Hunter suffered hypothermia while swimming to the Bunbury Sea Rescue building after he fell into the water from his yacht on Sunday afternoon.
His daughter Jasmine says he was doing the right thing and wearing a life-jacket and is lucky he only suffered hypothermia.
She said after he fell, the boat sailed off without her father, an experienced sailor, so he had no choice but to swim to shore.