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How to save yourself from drowning in a shipwreck
Wear a flotation device.
Hypothermia, shock, injury and exhaustion mean you cannot be guaranteed that you will swim to safety if an accident did happen. Wear a properly fitted life jacket that supports the neck and will keep your face out of the water if you fall unconscious.
Get away from anyone else in the water. Immediately after the accident is when you, as a strong swimmer, are in most danger.