The anonymous swimmer then brought Ms Frankcom to the surface and got her on board a boat.
BBC: A Great White Shark
The deck of some boats, such as the Taunton, a 228-foot Danish steamer built in 1902, lie just 10 feet below the surface, an easy duck dive for even an average swimmer.
BBC: Wreck diving in Bermuda
In an active drowning, a swimmer is at or below eye level at the surface of the water for about 10 to 20 seconds.
CNN: Water safety expert: 'Drowning doesn't just happen'
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