Three sisters of the Sacred Heart Order in Papua New Guinea, were travelling to their outer mission post, with medical supplies in a canoe. They were accompanied by a native boy.
The river flowed into the sea. They were swept far out to sea. The canoe overturned and they were in the water. Each of the sisters and the boy felt a dolphin underneath them, gently carrying them along.
The dolphins deposited them on an island. One of the sisters found a piece of glass on the island and a few days later the boy climbed a coconut tree and shined the piece of glass into the sun to create a light for ships at sea to notice. They were rescued by a passing ship. One of these nuns (an Australian) is the sister of one of our family friends.