Three fishermen in Palau were 36 hours overdue in their motorized fishing boat (engine trouble?) and two of them decided to swim (8 miles) to land.
Fortunately, a helicopter found the boat and learned of the swimmers from the third fisherman.
A Zodiac boat looking for the swimmers saw their signal mirror and rescued them on Christmas, 12/25/2015.
The link below is the only news story on this I have found.
Palau swimmers flag down Zodiac with Signal Mirror on Christmas