If your character is ever stranded in the water, try to stay near large objects or boats in the water while swimming. As long as you are near a large object, the shark will not attack and you will even be able to sprint swim to other large objects (as long as they are not far away), until you get to a place that is out of danger. Additionally, if you have no soundtrack playing at the time the music will change to a "Jaws"-like tune. This indicates that the shark is after you; find a large object to swim to quickly.