Yes, it's based on a true story. The story in 'Open Water 2' often makes viewers feel a sense of dread because it's rooted in reality. It depicts how quickly a day of fun on the water can turn into a nightmare. The characters in the movie are in a fight for their lives, much like those in the real - life events that inspired it. This connection to real - life gives the movie an extra layer of authenticity and horror.
Open Water 2 is purely fictional. It doesn't have roots in any actual events. The story and characters were crafted for the purpose of entertainment rather than being based on reality.