'Titanic: The True Story' is one of the many Titanic documentaries I've seen. It puts the 1997 movie up against the actual events. During the documentary, an experiment was conducted to see just how well the human body copes with being immersed in freezing water. Of course, they didn't use water as cold as what the ocean would have been the night Titanic sank (it would have been too dangerous for their test subject). First, the test subject had to stay in one spot and have their body temperature tested. Then they had to swim. The result of the experiment showed that, if those in the water that night had tried to swim to the closest lifeboat, they would have caught hypothermia faster because swimming would have made their body temperatures drop quicker than if they stayed still.